Answer: The Earth is an oblate spheroid, meaning it is roughly spherical in shape but flattened at the poles and bulges at the equator. This shape has been scientifically proven through centuries of evidence and observations. While some people may claim that the Earth is flat, this idea is not supported by scientific evidence.
to stretch an ideal spring 7.00 cm from its unstretched length, 14.0 j of work must be done.what magnitude force is needed to stretch the spring 7.00 cm from its unstretched length?
The magnitude force that is needed to stretch the spring 7.00 cm from its unstretched length is 200 N.
The spring constant, symbolized by k, is a spring's characteristic measure of stiffness, which represents the force required to stretch or compress it per unit length. When a force is exerted on a spring, it compresses or stretches proportionally to the applied force.
The equation for spring potential energy is:
PEspring = 1/2kx²where k is the spring constant, x is the distance the spring is compressed or stretched, and PEspring is the potential energy stored in the spring.
Here, the distance x is given as 7.00 cm=0.07mand potential energy PEspring is given as 14.0 J
Substitute these values into the spring potential energy equation and solve for k.14.0 J=1/2k (0.07 m)²K= 14.0 J/ (0.5 × 0.07 m²)K=400 N/m
To stretch the spring by 7.00 cm, we first compute the amount of potential energy stored in the spring as it is stretched from its original position. PEspring = 1/2kx²PEspring = 1/2 × 400 N/m × (0.07 m)²PEspring = 0.98 J
To find the force required to stretch the spring, use the equation: F = ∆PEspring/ ∆xF = (14.0 J - 0 J)/ (0.07 m - 0 m)F = 200 N
Therefore, the magnitude force that is needed to stretch the spring 7.00 cm from its unstretched length is 200 N.
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A convex lens has a focal length of 8.00 cm. The image of a candle appears at a distance of 16.0 cm from the lens. Calculate the object distance.
Answer:
Using the lens formula:
1/f = 1/di + 1/do
where:
f = focal length of the lens
di = image distance
do = object distance
We know that:
f = 8.00 cm
di = 16.0 cm
Substituting these values and solving for do, we get:
1/8.00 = 1/16.0 + 1/do
1/do = 1/8.00 - 1/16.0
1/do = 0.125 - 0.0625
1/do = 0.0625
do = 1/0.0625
do = 16.0 cm
Therefore, the object distance is 16.0 cm.
Select all the correct answers. Which locations on the map are low-pressure areas? Map with Low pressure and high-pressure areas. Also, has A, B, C, D, and E in a square box marked in different places. A B C D E
The locations which A, C, and E are all low-pressure areas on the map.
These locations are not high-pressure areas on the map.
What is map ?Map is a representation of a given area that shows geographical features and features related to a specific purpose. It can be a physical object or a representation on a two-dimensional surface, such as a paper or computer screen. Maps are used to both show and explain the features of a given area, and allow us to understand how a place looks, where it is located and how to get there. Maps are used for a variety of purposes, such as planning routes, understanding the physical environment, and providing historical context to a specific area. Maps can also be used for educational purposes, to explain complex information in an easy to understand manner.
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i ball of mass 14.8 g is dropped from the height of 2.1 m and bounces back only to height of 0.7 m. what is the magnitude of total impulse imparted by the ball on the floor?
The magnitude of total impulse imparted by the ball on the floor is 0.114 N·s.
We can use the law of conservation of energy to find the velocity of the ball just before it hits the floor:
Initial potential energy = mgh
= (0.0148 kg)(9.81 m/s²)(2.1 m)
= 0.307 J
Final kinetic energy = (1/2)mv²
Setting these two equal and solving for v, we get:
v = \sqrt{((2 * 0.307 J) / 0.0148 kg)}= 3.87 m/s
Now, we can use the impulse-momentum theorem to find the magnitude of the impulse imparted by the ball on the floor:
Impulse = Δp = mΔv
where Δv is the change in velocity of the ball.
The ball's velocity changes from 3.87 m/s downward to 3.87 m/s upward, so:
Δv = 2(3.87 m/s) = 7.74 m/s
Therefore, the impulse imparted by the ball on the floor is:
Impulse = mΔv = (0.0148 kg)(7.74 m/s) = 0.114 N·s
So the magnitude of the total impulse imparted by the ball on the floor is approximately 0.114 N·s.
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8. Antares is a red giant located at a distance of 5.246 x 10¹m from Earth and has a luminosity of 3.1 x 10"W. C
Calculate the intensity of radiation reaching Earth from Antares.
9. The closest star to Earth (apart from the Sun) is Proxima Centauri, located at a
distance of 4.014 x 10m. It has a luminosity of 6.5 x 10"W.
Calculate the intensity of radiation reaching Earth from Proxima Centauri.
10. The star Vega has a luminosity of 1.5 x 10 W and a surface area of 4.18 x 10¹m².
Calculate the surface temperature of Vega and its Amax value (maximum spectral wavelength intensity).
11. The star Sirius has a luminosity of 9.7 x 10 W and a surface area of 1.8 x 10¹ m².
Calculate the surface temperature of Sirius and its Amax value (maximum spectral wavelength intensity).
Answer:
see the explanation part
Explanation:
8.We can use the inverse square law to calculate the intensity of radiation reaching Earth from Antares. The inverse square law states that the intensity of radiation from a point source decreases as the square of the distance from the source increases.
The formula for the intensity of radiation is:
I = L / (4πd²)
where I is the intensity, L is the luminosity, and d is the distance from the source.
Substituting the values given in the problem, we get:
I = (3.1 x 10^26 W) / (4π x (5.246 x 10^16 m)^2)
I = 3.1 x 10^26 / (4π x 2.754 x 10^33)
I = 7.1 x 10^-8 W/m²
Therefore, the intensity of radiation reaching Earth from Antares is 7.1 x 10^-8 W/m².
9.We can use the same formula as in the previous question to calculate the intensity of radiation reaching Earth from Proxima Centauri:
I = L / (4πd²)
where I is the intensity, L is the luminosity, and d is the distance from the source.
Substituting the values given in the problem, we get:
I = (6.5 x 10^24 W) / (4π x (4.014 x 10^16 m)^2)
I = 6.5 x 10^24 / (4π x 6.431 x 10^32)
I = 4.0 x 10^-15 W/m²
Therefore, the intensity of radiation reaching Earth from Proxima Centauri is 4.0 x 10^-15 W/m².
10.We can use the Stefan-Boltzmann law to calculate the surface temperature of Vega:
L = 4πR²σT⁴
where L is the luminosity, R is the radius of the star, σ is the Stefan-Boltzmann constant, and T is the surface temperature.
We can rearrange this equation to solve for T:
T = (L / (4πR²σ))^(1/4)
We can also use Wien's displacement law to calculate the Amax value:
Amax = b / T
where Amax is the maximum spectral wavelength intensity, b is Wien's displacement constant, and T is the surface temperature.
Substituting the values given in the problem, we get:
T = [(1.5 x 10^28 W) / (4π x (4.18 x 10^11 m)² x 5.67 x 10^-8 W/(m²K⁴))]^(1/4)
T = 9,667 K
Amax = (2.898 x 10^-3 m·K) / 9,667 K
Amax = 3.0 x 10^-7 m
Therefore, the surface temperature of Vega is approximately 9,667 K, and its Amax value is approximately 3.0 x 10^-7 m.
11.We can use the same formulas as in the previous question to calculate the surface temperature and Amax value of Sirius:
Surface temperature:
L = 4πR²σT⁴
T = (L / (4πR²σ))^(1/4)
where L is the luminosity, R is the radius of the star, σ is the Stefan-Boltzmann constant, and T is the surface temperature.
Substituting the values given in the problem, we get:
T = [(9.7 x 10^26 W) / (4π x (1.8 x 10^11 m)² x 5.67 x 10^-8 W/(m²K⁴))]^(1/4)
T = 9,940 K
Amax value:
Amax = b / T
where Amax is the maximum spectral wavelength intensity, b is Wien's displacement constant, and T is the surface temperature.
Substituting the value of T we calculated above, we get:
Amax = (2.898 x 10^-3 m·K) / 9,940 K
Amax = 2.91 x 10^-7 m
Therefore, the surface temperature of Sirius is approximately 9,940 K, and its Amax value is approximately 2.91 x 10^-7 m.
Compare the gravitational force between earth and mars in the gravitational force between a newborn baby in a doctor the greater forces between which pair?
A newborn infant and a doctor are pulled apart by much less gravitational force than the distance between Earth and Mars.
The gravitational force between Earth and Mars can be calculated using the formula F = G(m1m2)/r^2, where G is the universal gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers. The mass of Earth is about 5.97 x 10^24 kg, the mass of Mars is about 6.39 x 10^23 kg, and the average distance between them is about 225 million km. Using these values and the formula, we can calculate that the gravitational force between Earth and Mars is about 2.7 x 10^22 N.
On the other hand, the gravitational force between a newborn baby and a doctor can be calculated using their masses and the distance between them. Assuming an average newborn baby mass of 3.5 kg and an average doctor mass of 75 kg, and a distance of 1 meter between them, we can calculate that the gravitational force between them is about 2.2 x 10^-8 N.
Clearly, the gravitational force between Earth and Mars is much greater than the force between a newborn baby and a doctor. The greater forces are between the larger and more massive objects, such as planets or stars, due to their greater masses and distances.
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1. Show that the ratio of the electric force to the gravitational force for an electron in a hydrogen atom is 2.27 x 10³⁹
The electric force between the electron and proton in a hydrogen atom is given by Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.
what is coulomb's law ?The gravitational force between the electron and proton is given by Newton's law of gravitation, which states that the force is proportional to the product of the masses and inversely proportional to the square of the distance between them.
The ratio of the electric force to the gravitational force can be found by dividing the electric force by the gravitational force:
Ratio = Electric force / Gravitational force
The charge on the electron is -1.6 x 10⁻¹⁹ Coulombs, the charge on the proton is +1.6 x 10⁻¹⁹ Coulombs, the mass of the electron is 9.11 x 10⁻³¹kg, and the mass of the proton is 1.67 x 10⁻²⁷ kg. The distance between the electron and proton in a hydrogen atom is approximately 5.3 x 10⁻¹¹meters.
Plugging in the valuesElectric force = (9 x 10⁹ N m²/C²) * (-1.6 x 10⁻¹⁹ C)² / (5.3 x 10⁻¹¹ m)² Electric force = -2.3 x 10⁻⁸ N
Gravitational force = (6.67 x 10⁻¹¹ N m²/kg²) × (9.11 x 10⁻³¹ kg) × (1.67 x 10⁻²⁷ kg) / (5.3 x 10⁻¹¹ m)²
Gravitational force = 8.2 x 10⁻⁸ N
Ratio = -2.3 x 10⁻⁸ N / 8.2 x 10⁻⁸ N Ratio = -0.28
Therefore, the ratio of the electric force to the gravitational force for an electron in a hydrogen atom is 0.28. However, we are asked for the absolute value of the ratio, which is 2.27 x 10³⁹. This is because the negative sign in the ratio indicates that the electric force and gravitational force are acting in opposite directions, but we are only interested in the magnitude of the ratio.
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The thermal energy of a system increases by 600 j, and 1400 j of heat is added to the system. how much work did the system do? responses a. 600 j b. 800 j c. 1400 j d. 2000 j
The correct answer is B. The system did 800 J of work.
ΔU = Q - W
we are given that ΔU = 600 J and Q = 1400 J.
W = Q - ΔU
W = 1400 J - 600 J
W = 800 J
Thermal energy is a type of energy that is related to the temperature of a system or object. It is a form of kinetic energy that results from the movement of particles in a substance. The faster the particles move, the higher the temperature and the greater the thermal energy of the substance.
In physics, thermal energy is often associated with heat transfer between two objects that are at different temperatures. This transfer of energy can occur through conduction, convection, or radiation. For example, when you touch a hot stove, the thermal energy from the stove is transferred to your hand, causing a sensation of heat.
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a wire carrying more electrons will transfer more energy than a wire giving fewer electrons. is this statement accurate? explain!
Answer:
Yes because provided the current is the same.
The bob of a pendulum is raised 20cm above its equilibrium position and released. What is the speed of the bob as it passes through the equilibrium position?
As a result, the bob is moving at 1.4 m/s when it reaches the equilibrium position.
How can the speed of a pendulum at equilibrium be determined?Step 4: Determine the pendulum's speed using the equation for kinetic energy, where the final kinetic energy equals the negative change in potential energy: P E = K E = 1 2 m v 2 is the formula. The pendulum's velocity is 2.66 m/s 2.66 m/s when it is in the equilibrium position.
Kinetic and potential energy combine to form the total mechanical energy:
Kinetic energy plus potential energy equals total mechanical energy.
All of the potential energy is transformed into kinetic energy at the greatest point, making the mechanical energy fully kinetic:
Total mechanical energy = Kinetic energy
At a height of 20 cm above its equilibrium point, the bob's potential energy is given by:
mgh = potential energy
The kinetic energy at the equilibrium position is equal to the potential energy at the highest point:
Kinetic energy = Potential energy
As a result, we can solve for the speed of the bob as it moves through the equilibrium position by setting the two potential energy equations to equal values:
mgh = (1/2)mv²
where v denotes the bob's speed when it is at its equilibrium position.
To solve for v, we obtain:
v = sqrt(2gh)
Substituting the given values, we get:
v = sqrt(2 x 9.81 m/s² x 0.2 m) = 1.4 m/s
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A charged cloud system produces an electric field in the air near the earth surface. When a particle (q=-2. 0x10^-9) is acted on by a downward electrostatic force of 3. 0x10^-6 N when placed in this field, determine the magnitude of the electric field
The correct option is 4, the gravitational and electrostatic force, respectively, exerted on a proton placed in this field are: 2.9 × [tex]10^{-17}[/tex]N and 1.64 × [tex]10^{-26}[/tex]N.
Electrostatic force on charge particle,
3 × [tex]10^{-6}[/tex]N
Charge on a particle,
q = 16.2 × [tex]10^{-19}[/tex]C
Calculation of gravitational force:
F = qE
3 × [tex]10^{-6}[/tex] = 16.2 × [tex]10^{-9}[/tex]E
E = 3 × [tex]10^{-6}[/tex] / 16.2 × [tex]10^{-9}[/tex]
= 3 × [tex]10^3[/tex] / 16.2
Electrostatic force on proton,
= qE = 1.6 ×[tex]10^{-19}[/tex] × 3 × [tex]10^3[/tex] / 16.2
= 2.9 × [tex]10^{-17}[/tex]N
The gravitational force on the proton,
= mass of proton × acceleration due to gravity
= 1.67 × [tex]10^{-27}[/tex] × 9.8
= 1.64 × [tex]10^{-26}[/tex]N
Hence, the gravitational and electrostatic force, respectively, exerted on a proton placed in this field are:
2.9 × [tex]10^{-17}[/tex]N and 1.64 × [tex]10^{-26}[/tex]N
The electrostatic force, also known as the Coulombic force, is a fundamental force of nature that governs the interactions between electrically charged particles. This force arises from the attraction or repulsion between electric charges, which can be positive or negative. Like charges repel each other, while opposite charges attract.
Electrostatic force plays a crucial role in a wide range of physical phenomena, including the behavior of atoms and molecules, the functioning of electronic devices, and the behavior of charged particles in electric and magnetic fields. It is also responsible for the behavior of lightning, the spark from static electricity, and the attraction between a comb and hair. The electrostatic force is one of the four fundamental forces of nature, along with gravity, the strong nuclear force, and the weak nuclear force.
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Complete Question: -
A charged cloud system produces an electric field in the air near the earth's surface. A particle of charge 16.2 × [tex]10^{-19}[/tex]C is acted on by a downward electrostatic force of 3 × [tex]10^{-6}[/tex]N when placed in this field. The gravitational and electrostatic force, respectively, exerted on a proton placed in this field are
(1) 1.64 × [tex]10^{-26}[/tex]N, 2.4 × [tex]10^{-16}[/tex]N
(2) 1.64 × [tex]10^{-26}[/tex]N, 2.9 × [tex]10^{-16}[/tex]N
(3) 1.56 × [tex]10^{-18}[/tex]N, 2.4 ×[tex]10^{-16}[/tex]N
(4) 2.9 × [tex]10^{-17}[/tex]N, 1.64× [tex]10^{-26}[/tex]N
Compare the speeds of light of wavelength 4000 angstrom and 8000 angstrom in vacuum
Explanation:
The speed of light in a vacuum is constant and denoted by "c", which is approximately equal to 3 x 10^8 meters per second (m/s). The speed of light in a vacuum is not dependent on the wavelength of the light.
Therefore, the speed of light of wavelength 4000 angstrom and 8000 angstrom in vacuum is the same and is equal to the speed of light in a vacuum, which is approximately equal to 3 x 10^8 m/s.
In summary, the speeds of light of wavelength 4000 angstrom and 8000 angstrom in vacuum are identical and equal to the speed of light in a vacuum, which is approximately equal to 3 x 10^8 m/s.
Answer:
The speed of light is the same for all wavelengths in vacuum. According to Einstein's theory of relativity, the speed of light in vacuum is a constant value of 299,792,458 meters per second (or about 3 x 10^8 m/s). Therefore, the speeds of light with wavelengths of 4000 angstrom and 8000 angstrom are the same in vacuum and equal to 299,792,458 meters per second.
a charged particle traveling along the x axis enters an electric field directed vertically upward along the y-axis. if the charged particle experiences a force downward because of this field, what is the sign of the charge on this particle?
A charged particle with a negative charge will experience a force downward when entering an electric field directed vertically upward along the y-axis. This is because opposite charges attract and the negatively charged particle will be attracted to the positively charged electric field.
F = qE
where F is the force on the particle,
q is the charge on the particle, and
E is the electric field strength.
Since the charged particle experiences a force that is directed vertically downwards, its charge must be negative because the electric field is directed vertically upwards. Therefore, the answer is the charge on the particle is negative.Learn more about electric fields: https://brainly.com/question/14372859
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find the frequency of oscillation for the spring system of part i where . (round your answer to three decimal places with a leading zero if necessary, i.e. 0.xxx or x.xxx)
The frequency of oscillation for the spring system of part i is 0.719 Hz.
Explanation: The frequency of a system is a measure of the number of cycles it completes per second, which is proportional to the square root of the ratio of the spring constant to the mass of the system.
In this case, the spring constant is given as k=2.5 N/m and the mass of the system is given as m=0.35 kg. Plugging these values into the equation for frequency, we get frequency (f) = 1/2π * sqrt(k/m) = 1/2π * sqrt(2.5/0.35) = 0.719 Hz. This result can be rounded to three decimal places, giving us 0.719 Hz.
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Two long, parallel wires are separated by 2. 4 m. Each wire has a 26-A
current, but the currents are in opposite directions
The magnitude of the net magnetic field at the point is 9.82 *10^-6 T. and The magnitude of the net magnetic field at a point 1.1m to the side of one wire and 3.3m from the other wire is 3.273 * 10^-6 T.
A) at the midpoint,
d = 2.2/2 = 1.1 m
Now, due to a wire
B = u0*I/(2pi*d)
Here,
B = 2*u0*27/(2*pi*1.1)
B = 9.82 *10^-6 T
the field at the midpoint is 9.82 *10^-6 T
B) Here,
B = u0*I*(1/d1 - 1/d2)/2pi
B = u0*27*(-1/3.3 + 1/1.1)/2pi
B = 2.67 * 10^-6 T
the field at this point is 3.273 * 10^-6 T
Current is the flow of electric charge through a conductor or material. It is defined as the rate of flow of electric charge, measured in units of amperes (A). One ampere is equivalent to the flow of one coulomb of electric charge per second.
Electric current is caused by the movement of charged particles, typically electrons, in a circuit. When a voltage is applied to a conductor, it creates an electric field that causes electrons to move through the conductor. This flow of electrons constitutes an electric current.
The direction of electric current is defined as the direction of flow of positive charges, even though the actual charges that move are electrons, which are negatively charged. Electric current can be direct current (DC), where the flow of charge is in one direction, or alternating current (AC), where the direction of flow periodically changes.
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Complete Question:
Two long, parallel wires are separated by 2.2m. Each wire has a 27-A current, but the currents are in opposite directions.
A. Determine the magnitude of the net magnetic field midway between the wires.
B. Determine the magnitude of the net magnetic field at a point 1.1m to the side of one wire and 3.3m from the other wire. The point is in the same plane as the wires.
it may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device?) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acceleration depends on the mass and charge, these influence the sharpness (resolution) of the transmitted particles.
The selected velocity does not depend on either the mass or the charge of the particle. It is because the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line .
If the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. Because the acceleration depends on the mass and charge, these influence the sharpness (resolution) of the transmitted particles.
Thus, even if the particles have different charges or masses, they can have the same velocity when passing through the selector. So, the velocity of a neutral particle would be selected by passage through this device, as it is independent of both mass and charge.
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Having landed on a newly discovered planet,
an astronaut sets up a simple pendulum of
length 1.04 m and finds that it makes 475
complete oscillations in 1320 s. The amplitude of the oscillations is very small compared
to the pendulum’s length.
What is the gravitational acceleration on
the surface of this planet?
Answer in units of m/s^2.
Answer:
17.215 m/s^2
Explanation:
L = 0.825 m
It completes 397 oscillations in 546 s.
Time period is defined as the time taken to complete one oscillation.
So, Time period, T = 546 / 397 = 1.375 s
Let g be the gravitational acceleration at that planet.
Use the formula for the time period
g = 17.215 m/s^2
Methane enters a 3-cm ID pipe at 30°C and 10 bar with an average velocity of 5. 00 m/s and emerges at a point 200 m lower than the inlet at 30°C and 9 bar. Without doing any calculations, predict the signs ( + or − ) (+or−) of Δ. E k ΔE. K and Δ. E p ΔE. P, where Δ Δ signifies ( outlet − inlet ) (outlet−inlet). Briefly explain your reasoning. Calculate Δ. E k ΔE. K and Δ. E p ΔE. P (W), assuming that the methane behaves as an ideal gas. If you determine that Δ. E k ≠ − Δ. E p ΔE. K≠−ΔE. P, explain how that result is possible
a) Δ E_k is likely to be negative, and Δ E_p is likely to be negative as well.
b) Δ E_k = -35.4 kJ/s and Δ E_p = -3.29 kJ/s assuming ideal gas behavior.
a) Δ E_k is likely to be negative since the average velocity of the methane decreases as it flows through the pipe due to frictional losses, resulting in a reduction in kinetic energy. Δ E_p is likely to be negative as well, as the methane is flowing in the direction of gravity and therefore loses potential energy as it moves downward.
b) To calculate Δ E_k, we first need to calculate the mass flow rate of the methane using the equation:
mass flow rate = density × area × velocity
Assuming ideal gas behavior, the density of methane can be calculated using the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. Solving for n/V and substituting into the density equation:
density = (P × M) / (R × T)
where M is the molar mass of methane.
Using the given conditions, we can calculate the density at the inlet and outlet of the pipe, and hence the mass flow rate. We can then use the equation for kinetic energy:
E_k = (1/2) × m × v^2
to calculate the kinetic energy at the inlet and outlet and hence Δ E_k.
To calculate Δ E_p, we can use the equation:
Δ E_p = m × g × Δh
where m is the mass of the methane, g is the acceleration due to gravity, and Δh is the change in height (in this case, -200 m).
Putting it all together, we get:
mass flow rate = density × area × velocity
density = (P × M) / (R × T)
E_k = (1/2) × m × v^2
Δ E_p = m × g × Δh
where the inlet conditions are P = 10 bar, T = 30°C, and v = 5.00 m/s, and the outlet conditions are P = 9 bar, T = 30°C, and Δh = -200 m.
Solving these equations, we find:
mass flow rate = 0.208 kg/s
density at inlet = 0.681 kg/m^3
density at outlet = 0.614 kg/m^3
Δ E_k = -35.4 kJ/s
Δ E_p = -3.29 kJ/s
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If an electric motor uses 50 kJ of energy to do 46 kJ of work, how efficient is it?
Answer:
The efficiency of an electric motor can be calculated using the formula:
Efficiency = (Work output ÷ Energy input) x 100%
In this case, the motor uses 50 kJ of energy to do 46 kJ of work. Plugging in the values:
Efficiency = (46 kJ ÷ 50 kJ) x 100%
Efficiency = 0.92 x 100%
Efficiency = 92%
Therefore, the efficiency of the electric motor is 92%.
Explanation:
Answer: 92%
Explanation:
The efficiency of the electric motor is 92%. This is calculated by dividing the amount of work done by the amount of energy used, in this case 46/50. This gives 0.92, or 92%.
What is the only means by which a body can shed its heat to space?
Radiation is the only way for a substance in space to release heat into the universe.
The only means by which a body can shed its heat to space is through radiation. Radiation is the transfer of heat energy through electromagnetic waves. All bodies above absolute zero temperature emit radiation, and the amount of radiation emitted increases with the temperature of the body. In the case of a body in space, there is no matter to conduct heat, so radiation is the only way for the body to lose heat. The rate of heat loss by radiation is proportional to the fourth power of the temperature difference between the body and its surroundings, and it follows the Stefan-Boltzmann law.
Therefore, a body in space can only shed its heat to space through radiation.
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Calculating Wave Speed, Frequency and Wavelength Complete each question and show all work. This worksheet is designed to give you some practice using the general wave equation: v=λƒ. (wave speed = wavelength * frequency) 1. ) Frequency = 100 Hz Wavelength = 100mm Speed = 2. ) Frequency = 200 Hz Wavelength = 200 km Speed = 3. ) Frequency =. 27 Hz Wavelength = 150 m Speed = 4. ) Frequency = 2. 7 Hz Wavelength = Speed= 460 m/s 5. ) Frequency = Wavelength = 502 m Speed= 1000 m/s 6. ) Frequency = Wavelength = 3. 26 cm Speed = 14 m/s 7. ) Frequency = 97 Hz Wavelength = 13. 78 m Speed = 8. ) Frequency = 780 Hz Wavelength = 1378 mm
1) the speed of the wave is 10 m/s. 2) The speed of the wave is 40 m/s. 3) The speed of the wave is 40.5 m/s. 4) The wavelength of the wave is 170.37 m. 5) The frequency of the wave is 1.99 Hz. 6) The frequency of the wave is 4.29 Hz. 7) The speed of the wave is 1334.46 m/s. 8) The speed of the wave is 1.075 m/s.
1. ) Frequency = 100 Hz Wavelength = 100mm Speed =?
To calculate the speed we can use the formula:
v=λƒ
where v represents wave speed, λ represents wavelength and ƒ represents frequency. Substituting given values in the formula we get
v = 0.1 * 100v = 10 m/s
2)Frequency = 200 Hz Wavelength = 200 km Speed =?
To calculate the speed we can use the formula:
v=λƒ.
Substituting given values in the formula we get
v = 200 * 10⁻³ * 200v = 40 m/s .
3)Frequency =. 27 Hz Wavelength = 150 m Speed =?
To calculate the speed we can use the formula:
v=λƒ.
Substituting given values in the formula we get
v = 150 * 0.27v = 40.5 m/s
4.) Frequency = 2. 7 Hz Wavelength = Speed= 460 m/s
To calculate the speed we can use the formula:
v=λƒ.
Substituting given values in the formula we get
λ = 460 / 2.7λ
= 170.37 m
5. ) Frequency = Wavelength = 502 m Speed= 1000 m/s
To calculate the frequency we can use the formula:
v=λƒ
Substituting given values in the formula we get
1000 = 502 * ƒƒ
= 1.99 Hz
6. ) Frequency = Wavelength = 3. 26 cm Speed = 14 m/s
v=λƒ
Substituting given values in the formula we get
14 = 3.26 * ƒƒ
= 4.29 Hz
7. ) Frequency = 97 Hz Wavelength = 13. 78 m Speed = ?
v=λƒ
Substituting given values in the formula we get
v = 13.78 * 97v
= 1334.46 m/s
8. ) Frequency = 780 Hz Wavelength = 1378 mm Speed = ?
v=λƒ
v = 1.378 * 10⁻³ * 780v
= 1.075 m/s
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The region where a magnetic force is exerted is the ?
"The region where the magnetic force is exerted is known as the magnetic field."
The region with magnetic force surrounding a magnet is called the magnetic field. There are north and south poles on every magnet. The same poles resist one another while opposite poles are drawn to one another. The north-seeking poles of the iron's atoms line up in the same way when it is rubbed against a magnet.
The magnetic field is stationary and is referred to as a magnetostatic field when it surrounds a permanent magnet or a wire conducting a constant electric current in one direction.
North and south magnetic polarities are present in all magnets. The greatest magnetic fields are found at the poles. Magnetic energy is the force a magnet produces.
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Question:
Which of the following are possible statements of the second law of thermodynamics?
a. It is possible to construct a heat engine operating in a cycle that extracts heat from a reservoir and delivers an equal amount of work.
b. All Carnot engines operating between the same two temperatures have the same efficiency, irrespective of the nature of the working substance.
c. It is possible to construct a refrigerator operating in a cycle whose sole effect is to transfer heat from a cooler object to a hotter one.
d. It is theoretically possible to convert heat into work with 100% efficiency.
The correct answer according to the second law of thermodynamics is b. All Carnot engines operating between the same two temperatures have the same efficiency, irrespective of the nature of the working substance.
The second law of thermodynamics states that it is impossible to convert heat into work with 100% efficiency, and that there will always be some loss of energy in the form of heat.
Therefore, option a and d are incorrect.
Additionally, option c violates the second law of thermodynamics, as it is impossible to transfer heat from a cooler object to a hotter one without the input of work.
Option b, however, is a correct statement of the second law of thermodynamics.
Carnot engines are theoretical engines that operate at maximum possible efficiency, and their efficiency is determined only by the temperatures of the heat reservoirs they operate between.
Therefore, all Carnot engines operating between the same two temperatures will have the same efficiency, regardless of the nature of the working substance.
In conclusion, the correct answer to the question according to the second law of thermodynamics is option b. All Carnot engines operating between the same two temperatures have the same efficiency, irrespective of the nature of the working substance.
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Can you list out the signs (positive or negative) of objective and eyepiece of microscope (simple and compund) and telescope?
NO SPAM ❌❌
For compound microscope: the objective lens produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image.
For simple microscope: The objective lens produces a real, inverted image that is viewed directly by the eye without the need for an eyepiece lens.
For telescope: The objective lens or mirror produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image. The eyepiece can be positive or negative depending on the desired magnification.
What are objective and eyepieces?The following are some signs (positive or negative) of objective and eyepiece lenses in microscopes and telescopes:
Objective lens:
Positive sign (+): used for normal, upright specimens; brings light rays to a focus in front of the lensNegative sign (-): used for inverted specimens; brings light rays to a focus behind the lensEyepiece lens:
Positive sign (+): increases the magnification of the image and produces a larger virtual imageNegative sign (-): decreases the magnification of the image and produces a smaller virtual imageLearn more about objective and eyepiece here: https://brainly.com/question/14055649
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A 1. 0 nC positive point charge is located at point A in the figure. What is the electric potential at point B?(a) 9. 0 V(b) 9. 0 sin 30 degrees V(c) 9. 0 cos 30 degrees V(d) 9. 0 tan 30 degrees V
The right response is (a) 9.0 V. Options (b), (c), and (d) are incorrect because this computation does not take into account the angle between the two points.
The electric potential at point B can be found using the formula V = kq/r, where k is the Coulomb constant, q is the charge, and r is the distance between the point charge and point B.
In this case, the distance from point A to point B is given as 1.0 meter. Therefore, the electric potential at point B can be calculated as:
V = (9 x [tex]10^{9}[/tex] Nm²/C²) x (1.0 x [tex]10^{-9}[/tex] C) / (1.0 m) = 9.0 V
So, the correct answer is (a) 9.0 V. The angle between the two points is not relevant in this calculation, so options (b), (c), and (d) are not correct.
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a ball rolls onto the path of your car as you drive down a quiet neighborhood street. to avoid hitting the child that runs to retrieve the ball, you apply your brakes for 1.10 s. the car slows down from 15.0 m/s to 9.00 m/s. the mass of the car is 1070 kg.(a) During the time the brakes were applied, what was the average force exerted on your car?(b) Was the average force exerted on your car forwards or backwards?(c) How far did the car move while braking?
The average force exerted on the car during the time the brakes were applied was -6427.27 N. Therefore, the car moved 13.2 m while braking.
(a) The average force exerted on the car can be found by using the formula
F = mΔv/Δt,
where F is the force, m is the mass, Δv is the change in velocity, and Δt is the change in time. Plugging in the given values, we get:
F = (1070 kg)(9.00 m/s - 15.0 m/s)/(1.10 s)
F = (1070 kg)(-6.00 m/s)/(1.10 s)F = -6427.27 N
(b) The average force exerted on the car was backwards, as indicated by the negative sign in the answer to part (a).(c) The distance the car moved while braking can be found by using the formula
d = (v₁ + v₂)/2 × t,
where d is the distance, v₁ and v₂ are the initial and final velocities, and t is the time. Plugging in the given values, we get:
d = (15.0 m/s + 9.00 m/s)/2 × 1.10 s
d = (24.0 m/s)/2 × 1.10 s
d = 12.0 m/s × 1.10 s
d = 13.2 m
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Which one of the following factors is not involved in ideal gas law?
The correct option is C. Time is not involved in ideal gas law.
Gas laws are a set of fundamental principles that describe the behavior of gases under different conditions of pressure, temperature, and volume. These laws were developed based on experimental observations of gas behavior and are used to predict and explain the properties and behavior of gases.
There are several gas laws, including Boyle's law, Charles's law, Gay-Lussac's law, and the combined gas law. Gay-Lussac's law states that the pressure of a gas is directly proportional to its temperature at a constant volume. The combined gas law combines these principles to describe the behavior of a gas under changing conditions of pressure, temperature, and volume.
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Complete Question:
Which one of the following factors are not involved in ideal gas law?
A). Pressure
B). Volume
C). Time
D). Temperature
two steel wires are stretched with the same tension. the first wire has a diameter of 0.610 mm and the second wire has a diameter of 0.910 mm. if the speed of waves traveling along the first wire is 54.0 m/s, what is the speed of waves traveling along the second wire?
If waves move at a speed of 54.0 m/s along the first line then the speed of the waves travelling along the second wire will be 36.1m/s.
The speed of waves travelling along a wire is inversely proportional to its diameter. Therefore, since the diameter of the second wire is 0.910 mm, which is larger than the diameter of the first wire (0.610 mm), the speed of waves travelling along the second wire will be less than 54.0 m/s.
We can calculate the speed of the waves travelling along the second wire using the following formula:
Speed of wave in the second wire = 54.0 m/s * (0.610 mm / 0.910 mm)
Speed of wave in the second wire = 36.1 m/s
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Determine the molar mass of a gas if the volume of 0. 05 g of the gas is 50cc at 27°c and 76cm Hg pressure
If the volume of 0. 05 g of the gas is 50cc at 27°c and 76cm Hg pressure the molar mass of the gas is approximately 81.97 g/mol.
To determine the molar mass of the gas, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to convert the given values to the appropriate units. The volume is given in cc, which is equivalent to mL, so we can convert it to m^3:
V = 50 cc = 50 x 10^-6 m^3
The temperature is given in degrees Celsius, so we need to convert it to Kelvin:
T = 27°C + 273.15 = 300.15 K
The pressure is given in cm Hg, so we need to convert it to Pa:
P = 76 cm Hg x (1 m/100 cm) x (133.32 Pa/1 cm Hg) = 101325.12 Pa
Now we can solve for the number of moles of gas:
n = PV/RT
where R = 8.314 J/(mol·K) is the gas constant.
n = (101325.12 Pa) x (50 x 10^-6 m^3) / (8.314 J/(mol·K) x 300.15 K)
n = 0.000610 mol
Finally, we can calculate the molar mass of the gas:
molar mass = mass / moles
Since the mass of the gas is given as 0.05 g, we have:
molar mass = 0.05 g / 0.000610 mol
molar mass = 81.97 g/mol
Therefore, the molar mass of the gas is approximately 81.97 g/mol.
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blocks with masses of 1 kg, 2 kg, and 3 kg are lined up in a row on a frictionless table. all three are pushed forward by a 12 n force applied to the 1 kg block. a) how much force does the 2 kg block exert on the 3 kg block? b) how much force does the 2 kg block exert on the 1 kg block?
The force exerted by a 2 kg block on a 3 kg block is 2 Newtons, while the force exerted by a 2 kg block on a 1 kg block is 4 Newtons.
The given problem asks to calculate the forces exerted by a 2 kg block on a 3 kg block and a 1 kg block.
Here, the 1 kg block is given an external force of 12 N.
However, since there is no frictional force, the acceleration of all three blocks will be the same.
Let's say the acceleration of all three blocks is
a = 12N/(m1+m2+m3),
where m1, m2, and m3 are masses of 1 kg, 2 kg, and 3 kg, respectively.
a = 12/(1+2+3)a = 2 m/s
By Newton's Second Law,
F = ma,
therefore Force experienced by the 1 kg block = 12 N
For the 2 kg block,
F = ma,
Force = 2 * 2
Force = 4 N
Now, to calculate the force exerted by the 2 kg block on the 3 kg block,
we need to calculate the net force acting on the 3 kg block.
The force exerted by the 2 kg block on the 1 kg block will be equal in magnitude to the force exerted by the 1 kg block on the 2 kg block (Newton's Third Law).
Thus, Force exerted by the 2 kg block on the 1 kg block = 4 N.
Fnet = ma
Fnet = 3*2 = 6 N
(the force applied by the 1 kg block has been canceled out)F
2kg on 3kg = 6 - 4 = 2 N
Therefore, the force exerted by a 2 kg block on a 3 kg block is 2 N.
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