half-life of the isotope br3574 is 25.4 minute The amount of isotope remained after 90min = 0.01g
number of periods= time/ half life
= 90/25,=3.6
so at each time 4/3.6=1.1, 1.1/7.2= 0.15 and 0.15/10.8=0.01g
The period of time it takes for one-half of a radioactive isotope to decay is known as the half-life. A given radioactive isotope's half-life is constant; it is unaffected by external factors and independent of the isotope's starting concentration.
or
Half-life is the length of time it takes for a radioactive element to decay to half of its initial value. This suggests that a source's activity has a half-life when it takes time for it to decrease to half its initial value
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How many fundamental charges make up the value of the enclosed charge? (answer in billions)
[tex]{\color{Blue} N=3.47\ billions}[/tex]
The electric flux through green spherical surface is[tex]\rightarrow \Phi=62.8\ N\ m^{2}\ C^{-1}[/tex]
Permittivity of free space is [tex]\rightarrow \epsilon_{0}=8.85\times10^{-12}\ F\ m^{-1}[/tex]
Fundamental unit charge value is [tex]\rightarrow q=1.602\times10^{-19}\ C[/tex]
According to Gauss's law, electric flux is directly proportional to the enclosed charge [tex]Q_{enc}[/tex] inside spherical surface, which is given as:
[tex]\therefore \Phi=\frac{Q_{enc}}{\epsilon_{0}}[/tex]
[tex]\therefore Q_{enc}=\Phi \epsilon_{0}[/tex]
[tex]\therefore Q_{enc}=62.8 \times8.85\times10^{-12}[/tex]
[tex]\therefore Q_{enc}=555.75\times10^{-12}\ C[/tex]
therefore, total enclosed charge inside spherical surface is [tex]Q_{enc}=555.75\times10^{-12}\ C.[/tex]
Since charge is quantized, number of fundamental charges N is given as:
[tex]Nq=Q_{enc}[/tex]
[tex]\therefore N=\frac{Q_{enc}}{q}[/tex]
[tex]\therefore N=\frac{555.76\times10^{-12}}{1.602\times10^{-19}}[/tex]
[tex]{\color{Blue} \therefore N=3.47\times10^{9}}[/tex]
[tex]{\color{Blue} \therefore N=3.47\ billions}[/tex]
Therefore, [tex]{\color{Blue} N=3.47\ billions}[/tex] fundamental charges make up the value of the enclosed charge.
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receptacles have several screw terminals for the attachment of circuit conductors. match the following screws with their intended conductor.
A. Equipment grounding conductor B. Hot (phase) conductor C. Grounded (white) conductor
Matching is done as:Silver-colored screw is matched with C) Grounded (white) conductor
Brass-colored screw is matched with B) Hot (phase) conductor
Green hexagonal screw is matched with A) Equipment grounding conductor.
Electrical conductorA substance or material that permits the flow of electricity is known as an electrical conductor.
What are the three different types of conductors?When a voltage is applied, electrical charge carriers, typically electrons or ions, move easily from atom to atom.
Are conductors a component of a circuit?There are four different types of conductors: good conductors, semiconductors, resistors, and non-conductors.
Metals are effective electrical conductors. One or more loosely bonded valence electrons, or even just one, can be found in metals. These electrons can freely flow around an electric circuit, creating a domino-like effect.
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Cooper communicates with brand using radio waves of wavelength 300 m. what is the frequency of this wave?
The frequency of electromagnetic waves is 10⁶ Hz or 1 MHz.
We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as
c = λ . f
where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.
From the question above, we know that
λ = 300 m
By substituting the given parameter, we can calculate the frequency of radiowaves
c = λ . f
f = c / λ
f = 3 x 10⁸ / 300
f = 10⁶ Hz
f = 1 MHz
Hence, the frequency of radiowaves is 10⁶ Hz or 1 MHz.
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If the mass of a sliding block is tripled while a constant net force is applied, by how much does the acceleration change?.
The correct answer is rate of acceleration will be reduced by 3.
Newton's law states that the force acting on an object is inversely proportional to its rate of acceleration. This means that if an object's mass remains constant, its acceleration will fluctuate in accordance with its applied force, and vice versa.
A vector number called acceleration can be used to describe how quickly an object changes its velocity. If an object is constantly altering its velocity, it is still accelerating.
By Newton's law.
F=ma
The force is F.
m is the object's mass.
A represents acceleration.
The mass will triple if
a'=1/3×F/m
a'=a/3
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What height does a frictionless playground slide need so that a 35 kg child reaches the bottom at a speed of 4.7 m/s?
By conservation of energy, the height of the playground slide should be 108.241 meters.
We need to know about the conservation of energy to solve this problem. The energy can not be created or destroyed, the only way is to change to another form. It can be written as
Ei = Ef
where Ei is initial energy and Ef is the final energy
From the question above, we know that
m = 35 kg
v = 4.7 m/s
The playground slide is converting the potential energy from height to kinetic energy. Hence,
Ei = Ef
PE = KE
m . g . h = 1/2 . m . v²
h = 1/2 . g . v²
h = 1/2 . 9.8 . 4.7²
h = 108.241 meters
Hence, the height of playground slide should be 108.241 meters to reach 4.7 m/s of velocity at bottom.
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An electron was accelerated from rest through a potential difference of 2500 v. what is its speed?
The velocity of electron accelerated from rest through a potential difference of 2500 V will be 2.9654848 × 10⁷ m/s.
We have an electron accelerated from rest through a potential difference of 2500 V.
We have to determine its speed.
What is the Kinetic energy of the electron when accelerated through a potential difference of V volts ?The Kinetic energy of electron when accelerated through a potential difference of V volts is -
E = eV
According to the question -
Applied Potential Difference = V = 2500 volts
The Kinetic Energy of electron = K[E] = 1.6 x 10¹⁹ x 2500.
Therefore -
1/2 mv² = eV
[tex]$v =\sqrt{\frac{2|e|V}{m_{e} }}\\[/tex]
[tex]$v =\sqrt{\frac{2\times 1.6\times 10^{-19}\times 2500}{9.1\times 10^{-31} }}\\[/tex]
v = 29654848 = 2.9654848 × 10⁷ m/s
Hence, the velocity of electron accelerated from rest through a potential difference of 2500 V will be 2.9654848 × 10⁷ m/s.
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a honeybee leaves the hive and travels a total distance of 2 km before returning to the hive. what is the magnitude of the displacement vector of the bee? why?
The magnitude of the displacement vector of the bee will be 2 km. Because the distance between the endpoints is 2km.
What is displacement?A displacement is a vector in engineering and mechanics that has a length equal to the smallest distance between a point P's initial and final positions. It is a vector quantity. The SI unit of the displacement is the meter.
A honeybee leaves the hive and travels a total distance of 2 km before returning to the hive.
The bee's displacement vector will be 2 kilometers in length. Mostly due to the 2 kilometers between the terminals.
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You are traveling on an airplane. The velocity of the plane with respect to the air is 120 m/s due east. The velocity of the air with respect to the ground is 43 m/s at an angle of 30° west of due north.
1)What is the speed of the plane with respect to the ground?
The speed of the plane with respect to the ground will be 117.89 meters per second.
In this question, we need to determine the plane's relative speed to the ground because that will move east at 130 meters per second. The wind is blowing roughly in this direction at 30 meters per second and is at an angle of 30 degrees west of north.
Therefore, we need to identify the x and y components of the wind in order to compare these. We know that x will be equal to 30 times the cosine of our angle. Y will equal 30 times the sine of 60 degrees and we obtain a cosine of 60 degrees. Therefore, in this instance, 30 cosine of 60 will result in 15 and 30 sin of 60 will result in 15 square roots of 3 points.
Therefore, if we want to determine the magnitude of the plane with respect to the graph, we must combine our similar forces. To do this, we will need the square root of 130 for the plane, the minus sign because the wind is blowing in the opposite direction in this case, the x minus 15 square, the n plus our y component, 15 square root of 3 square, and the plane itself.
We now know that 3600 seconds equal 1 hour when translated to seconds. Therefore, we are aware that distance equals velocity multiplied by time. We should arrive at 24804 meters if we multiply our speed, which is 117.89 meters per second, by 3600 seconds.
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what is the number of waves here?
Answer: i counted 10 waves on your graph
Explanation: hope this helps!!!
Answer:
The Number of waves is 9 based on the trough and crest.
How did the photoelectric effect lead einstein to propose that light is quantized?
The correct answer is Einstein proposed that light must be made up of packets to explain the photoelectric effect (particles). The frequency of a light packet affects how much energy it contains. Whether or not a single photon has enough energy to knock an electron loose determines whether or not a metal will emit electrons.
The kinetic energy of the electrons is precisely proportional to intensity because, according to wave theory, the energy of electromagnetic waves is uniformly distributed over the wavefront and solely depends on the intensity of the input light beam. However, it was discovered through experimentation that the kinetic energy is unrelated to the brightness of the incident light.
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In what net direction will water diffuse (by osmosis) when the following solutions are brought into contact with each other on different sides of a semipermeable membrane?
When the following solutions are brought into touch with one another on various sides of a semipermeable membrane, the net direction that water would diffuse (via osmosis) is that Water travels through osmosis from low solute concentration areas to high solute concentration areas.
What is osmosis?Osmosis is the naturally occurring diffusion or passage of water or other solvents over a semipermeable membrane (one that prevents the passage of solutes, or dissolved compounds).
German plant physiologist Wilhelm Pfeffer began a systematic study of the crucial biological process in 1877.
What elements determine the net rate and direction of osmosis?Both the pressure gradient and the concentration gradient affect the net direction and rate of osmosis.
What three forms of osmosis are there?Hypertonic, isotonic, and hypotonic are the three osmotic states.
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Two cars, A and B start out 300 meters apart. Car A travels due east toward car B at 30 meters per second. Car B travels due west toward car B at 20 meters per second. How long does it take before the two cars meet?
By using one as a frame of reference, we will see that 6 seconds elapse before the two cars meet.
The correct option is B.
What are the various types of frames of reference?A frame of reference is a clearly defined coordinate system that is used to represent a body's motion or state of rest. Reference frames can be divided into two categories: inertial or non-accelerating frames and non-inertial or accelerating frames.
Briefing:This moves at 30 m/s, then we will see that car A does not move, while car B moves with a speed of:
S = 20m/s + 30m/s = 50m/s
The two cars are moving in opposing directions, therefore the velocities are summed (So car A sees that car B comes faster than it actually does).
We just need to determine how long it will take automobile B to drive 300 metres at 50 m/s now that we are in this frame of reference.
Distance/speed = time
distance = 300m
speed = 50m/s.
(300m)/( 50 m/s) = 6s
This means that 6 seconds elapse before the two cars meet.
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The complete question is -
Two cars, A and B start out 300 meters apart. Car A travels due east toward car B at 30 meters per second. Car B travels due west toward car B at 20 meters per second. How long does it take before the two cars meet?
A- 15s
B- 6s
C- 10s
D- 5s
How do we know when v final is negative or 0 in projectile motion?
Answer:
The Vertical initial velocity for a projectile can be zero for an infinite number of cases. The only requirement stands that the initial velocity (velocity at the time we start observing) should be zero, independent of acceleration along that axis or any other perpendicular axis.
If a balloon is filled with 1.205 quarts of radon gas how many atoms will be in the balloon?
By Avogadro's number, the radon atoms is 3.02 x 10²² atoms.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many carbon atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
V = 1.205 qt = 1.205 x 0.95 lt= 1.14475 lt
ρ = 9.73 g/lt
Ar = 222
Calculate the mass of radon
m = ρ . V
m = 9.73 . 1.14475
m = 11.14 gram
Calculate the moles
n = m / Ar
n = 11.14 / 222
n = 0.05 mol
Calculate the number of atoms
N = n . Na
N = 0.05 . 6,02 × 10²³
N = 3.02 x 10²² atoms
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air temperature rises form a morning low of 42'f to an afternoon high of 70f. a. express these temperatures in r, k, and c.
The temperature can be converted by using the conversion relationship.
What is unit conversion?It is defined as the conversion from one quantity unit to another quantity unit followed by the process of division, and multiplication by a conversion factor.
It is given that:
Air temperature rises from a morning low of 42'f to an afternoon high of 70f.
The temperature of 42°F can be converted as:
Converting from F to C:
= (5/9)(42 - 32)
= 5.55°C
Converting from F to R:
= (42 + 459.670)
= 501.67°R
Converting from F to K:
= [5/9](42 - 32) + 273.70
= 278.705°K
The temperature of 70°F can be converted as:
Converting from F to C:
= (5/9)(70 - 32)
= 21.11°C
Converting from F to R:
= (70 + 459.670)
= 529.67°R
Converting from F to K:
= [5/9](70 - 32) + 273.70
= 294.261°K
Thus, the temperature can be converted by using the conversion relationship.
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Find the resultant of the following forces: (a) 425 newtons at 55 degrees; (b) 5 newtons at 161 degrees; (c) 35 newtons at 320 degrees.
consider F1 = 425 N θ1 = 55
F2 = 5 N θ2 = 161
F3 = 35 N θ3 = 320
Now, take x and y component of force
Fx = F1cos55 + F2cos161 + F3 cos320
fx= 425 * 55 + 5 * (-0.94) + 35 * 0.76
fx =242.2- 4.7+ 26.6
fx =264.1
now fy
Fy = F1sine55 + F2sine161 + F3 sine320
fy= 425 * 0.81 + 5 * 0.32 + 35 * (-0.64)
fy = 344.2+1.6-22.4
fy = 323.4
now resultant force
Fr^2= fx^2+fy^2
= (264.1)^2 + (323.4)^2
Fr= 417
now, consider F1 = 425 N θ1 = 55
F2 = 5 N θ2 = 161
F3 = 35 N θ3 = 320
Now, take x and y component of force
Fx = F1cos55 + F2cos161 + F3 cos320
fx= 425 * 55 + 5 * (-0.94) + 35 * 0.76
fx =242.2- 4.7+ 26.6
fx =264.1
now fy
Fy = F1sine55 + F2sine161 + F3 sine320
fy= 425 * 0.81 + 5 * 0.32 + 35 * (-0.64)
fy = 344.2+1.6-22.4
fy = 323.4
now resultant force
Fr^2= fx^2+fy^2
= (264.1)^2 + (323.4)^2
Fr= 417
now, resultant angle
tan θ =fy/fx
= 323.4/264.1
tan θ = 1.2
θ =0.020
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CA-Common Core English Language Arts 9 A
Answer:
The standards establish guidelines for English language arts (ELA) as well as for literacy in history/social studies, science, and technical subjects.
Explanation:
Answer:
A
Explanation:
a rock takes 2.65 s to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.2 m/s.
The rock takes 2.65 s to hit ground when it is thrown up from the cliff with initial velocity of 8.2 m/s. The cliff is of 8.26 meters height.
What is a cliff?A cliff is a section of rock with an overall angle defined by the vertical or nearly vertical in geography and geology. Cliffs are created by the gravitational effects of weathering, erosion, and other activities. Cliffs are typical around rivers, in mountainous regions, escarpments, and on coastlines. Typically, cliffs are made of weather- and erosion-resistant rock. Sandstone, limestone, chalk, and dolomite are the sedimentary materials most likely to result in cliff formation. Cliffs are frequently formed by igneous rocks like granite and basalt. A geologic fault's movement, a landslide, or occasionally rock slides or falling rocks that alter the differential erosion of the rock can result in an escarpment (or scarp), a type of cliff.
The known values are: t=2.65st=2.65s;
y=0m,v0=+8.00m/sv
0=+8.00m/s; and a=-9.8m/s^2
a=-9.8m/s^2[tex]\sqrt{x} \sqrt{x} \sqrt{x} \sqrt{x}[/tex]
Based on the given values, the formula that we shall use is
y=y0+v0t+1/2at^2
Substituting the values, we have
y=y0+v0t+1/2at^2
=8.26m
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How much work have you done when you lift a 90-N child 0.5 m
Answer: not alot
Explanation:
Under each diagram right the net force and the direction in which the boxes will move
Green box is subject to balanced force, while red, blue, and green boxes are under unbalanced force.
When there is a balanced force, forces acting in the opposite direction are applied to the body. Zero net force is produced when equal forces are applied in each direction. The body continues to be in an equilibrium state. The body doesn't accelerate at all.
If it was initially at rest, it stays there, and if it was in motion, it keeps moving constantly while under an unbalanced force. The net force is not zero when just one direction is affected by the force of direction. Alternatively, the direction of motion is determined by the net resultant force when the forces acting on each side are not equal.
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A human-operated spaceship reaches the moon in 3 days. the moon is about 386,400 km from earth. mars, our closest planetary neighbor, is, at its closest, about 140 times farther away from us than the moon if mars stays in place. assuming a very simple model of the solar system, about how long would it take that same spaceship to reach mars?
That identical spaceship takes around a year to get to mars.
The Earth's axial wobble is stabilized by the Moon, the biggest and brightest object in our night sky, leading to a typically stable climate. As a result, Earth is a more hospitable planet. Moreover, it produces tides, which result in a rhythm that has guided mankind for a very long time. The following calculation must be performed to determine how long it will take the same spacecraft to reach Mars given that Mars is 140 times further away from Earth than the Moon and that a spacecraft can traverse the 386,400 kilometers between the Earth and the Moon in 3 days:
140 x 3 = 420 days
This spaceship will travel from Earth to Mars in just about one year and two months, assuming a year has 365 days.
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ow many times as strong is the coulomb repulsion between two electrons than the gravitational attraction between the same two electrons? (the distance does not matter.)
According to this estimate, at any distance, the gravitational force between two electrons is always 4.1 x 10^42 times stronger than the electric force between them.
What is gravitational attraction?Gravitational attraction definitions. The force of attraction between all masses in the universe, particularly the pull of the earth’s mass on objects that are close to its surface.
Gravitation, gravitational force, and similar terms.
Case Studies of GravityThe force interacting with the Earth and Sun. the driving force behind the Moon’s revolving orbit around the Earth. The force of the Moon is what drives the tides in the ocean. The force trapping every gas inside the Sun.
What triggers the gravitational pull?The mass of the Earth is what creates gravity. The combined gravitational force of all of its mass acts on the mass in your body. What gives you weight is that. Moreover, if you lived on a planet with a mass lower than
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Solenoid is wound with 2000 turns per meter when the current is 5.2 a, what is the magnetic field within the solenoid?
The magnetic field within the solenoid is 0.013T
What is Solenoid ?An electromagnet known as a solenoid creates a regulated magnetic field using a helical coil of wire whose length is significantly higher than its diameter. When an electric current is sent through the coil, it may create a consistent magnetic field inside a defined region of space.
A solenoid operates by creating an electromagnetic field surrounding an armature, which is a moving core. The electromagnetic field causes the armature to move, and when it does, it opens and closes valves or switches, converting electrical energy into mechanical motion and force.
The magnetic field within the solenoid can be calculated by the expression given below.
Write the expression for magnetic field within the solenoid.
B = u₀nI
B = 4π * 10⁻⁷ * 2000 * 5.2
= 0.013 T
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for a rigid body with particles, let the particle positions in the world space be 1, 2, … , , and the masses of the particles be 1, 2, … , . compute the center of mass of the rigid body in the world space.
The center of mass of the rigid body in the world space will be given below.
[tex]\rm x_{cm} = \dfrac{m_1x_1 + m_2x_2 + ... }{m_1 + m_2 + ... }\\\\\\\rm y_{cm} = \dfrac{m_1y_1 + m_2y_2 + ... }{m_1 + m_2 + ...}\\\\\\\rm z_{cm} = \dfrac{m_1z_1 + m_2z_2 + ... }{m_1 + m_2 + ... }[/tex]
What is the center of mass?The unique location where the graded relation of the scattered mass adds to zero is known as the center of mass in physics. Here is where a load may indeed be exerted to produce a moving object without also producing an angular acceleration.
The center of mass is given as,
[tex]\rm x_{cm} = \dfrac{m_1x_1 + m_2x_2 + ...... + m_nx_n}{m_1 + m_2 + .... + m_n}\\\\\\\rm y_{cm} = \dfrac{m_1y_1 + m_2y_2 + ...... + m_ny_n}{m_1 + m_2 + .... + m_n}\\\\\\\rm z_{cm} = \dfrac{m_1z_1 + m_2z_2 + ...... + m_nz_n}{m_1 + m_2 + .... + m_n}[/tex]
For a rigid body with particles, let the particle positions in the world space be 1, 2, … and the masses of the particles be 1, 2, ….
Then the center of mass will be
[tex]\rm x_{cm} = \dfrac{m_1x_1 + m_2x_2 + ... }{m_1 + m_2 + ... }\\\\\\\rm y_{cm} = \dfrac{m_1y_1 + m_2y_2 + ... }{m_1 + m_2 + ...}\\\\\\\rm z_{cm} = \dfrac{m_1z_1 + m_2z_2 + ... }{m_1 + m_2 + ... }[/tex]
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2. A car acquires a velocity of 32 m/s by accelerating at 4.0 m/s²
for 5.0 s. What was its initial velocity?
Answer:
v = a t = 4 m/s^2 * 5 s = 20 m/s
It can increase its speed by 20 m/s
Using V = V0 + a t
V0 (initial speed) had to be 12 m/s
How much metabolic energy must a bird of mass 200 g expend to fly to a height of 20 m? neglect all losses due to friction, physiological imperfection, and the acquisition of kinetic energy.
The amount of metabolic energy expended by the bird is 39.2 J.
What do you mean by energy?Energy is the ability to perform work in physics. It might exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc. Additionally, there is heat and work, which is energy being transferred from one body to another. Energy is always assigned based on its type once it has been transmitted. Thus, heat transmitted may appear as thermal energy while labor performed may result in mechanical energy. Motion is a property of all energy types. For instance, if a body is moving, it possesses kinetic energy. Even while at rest, a tensioned object like a spring or bow has the ability to move; this is due of its design, which includes potential energy.
E = mgh = (0.20)*(9.8)*(20) = 39.2 J
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You shoot a beam of 4. 5 ev light at a metal surface and notice that electrons are being released from the metal. What will happen if you then increase the intensity of the 4. 5 ev light?.
When we increase the intensity of incident light, the number of electrons ejected from the metal surface has increased energy. Thus, correct option is D.
What is Emission Energy?Electrons are emitted from the metal surface when it is exposed to light. This is called the photoelectric effect. Each metal has a certain threshold frequency of light at which an electron is emitted. Above this frequency, the electron is emitted and the extra energy is transferred to the electron.
On increasing the intensity of incident light, the kinetic energy of electrons increases several folds. This is because, energy of an electron is directly proportional to the intensity of incident light. Thus, D is the correct option.
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Your question is incomplete, probably the complete question/missing part is:
You shoot a beam of 4. 5 ev light at a metal surface and notice that electrons are being released from the metal. What will happen if you then increase the intensity of the 4. 5 ev light?
A. The metal will bend and warp.
B. Nothing, the energy of the light is the same.
C. More electrons would be released.
D. Photons would come off at higher speeds.
Object 1 is moving north at 10 mph and object 2 is also moving north at 5 mph. what is the velocity of object 1 relative to object 2?
The relative velocity of object 1 with respect to object 2 will be → +5 mph along the positive y - axis.
We have two objects moving in north direction.
We have to determine the relative velocity of object 1 relative to object 2.
What is Relative velocity?
The velocity of an object A relative to another object B is the velocity that object A would appear to have to an observer moving with B.
According to the question, we have -
The velocity of Object 1 = v(1) = [tex]10\;a_{y}[/tex] mph
The velocity of Object 2 = v(2) = [tex]5\;a_{y}[/tex] mph
Since the two objects 1 and 2 are moving in the same direction, therefore the velocity of object 1 relative to object 2 will be -
v(1)' = v(1) - v(2) = [tex]10\;a_{y}[/tex] - [tex]5\;a_{y}[/tex] = [tex]5\;a_{y}[/tex] mph
Hence, the relative velocity of object 1 with respect to object 2 will be → +5 mph along the positive y - axis.
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Question 2 (1 point)
A football is punted and flies upward at 19.6 m/s. It is in the air for
Blank 1:
seconds before it lands. (report a whole number)
Answer:
Statement of the given problem,
A ball is thrown vertically upwards at 19.6 m/s. For its complete trip (up and back down to the starting position), what is its average speed?
Let H & T denote the maximum height (in m) of the given ball & the time (in s) required for it to reach there.
Hence from above data we get following kinematic relations,
T = [19.6 m/s - 0 m/s)]/(9.8 m/s^2) [9.8 m/s^2 = gravitational acceleration (assumed)]
or T = 2 (s)
H = (19.6 m/s)*(2 s) - (1/2)*(9.8 m/s^2)*(2 s)^2
or H = 19.6 (m)
Therefore,
assuming vertically upward & downward motions are identical with respect to time & distance covered by the given ball,
the required average speed of the ball during its travel up and back down to the starting position
= (total travel-distance)/(total travel-time)
= 2*(19.6 m)/[2*(2 s)]
= 9.8 m/s [Ans]
Suppose you mix an unknown clear liquid with water and the added liquid mixes completely with the water so that no layers are visible. what is most likely true about the unknown liquid?
polar liquid is most likely true about the unknown liquid.
What exactly are polar liquids?However, in polar liquids, the uneven charge distribution in the liquid's molecules means that the attractive and repulsive forces do not balance out, and the liquid deflects when exposed to an electric field.Polar Molecule Examples
Water is a polar molecule (H2O)Because oxygen atoms have a higher electronegativity than other atoms in the molecule, they attract electrons, making ethanol polar. Ammonia (NH3) is polar.SO2 (sulfur dioxide) is polar.H2S (hydrogen sulfide) is polar.Water (H2O), like hydrogen fluoride (HF), is a polar covalent molecule. When you look at a diagram of water you can see that the two hydrogen atoms are not evenly distributed around the oxygen atom.To learn more about polar liquids refer to
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