repeating anyone ineed answers plsss?
Answer:
the answer of question no5 is b
Simone is walking her dog on a leash. The dog is pulling with a force of 32 N to the right and Simone is pulling backward with a force of 16 N.
What is the net force on them?
N
Is this force balanced or unbalanced?
Will the dog move forward, backward, or remain stationary?
Answer:1.16
2.unbalanced
Explanation:
Answer:
What is the net force on them?
⇒ 16 N
Is this force balanced or unbalanced?
⇒ unbalanced
Will the dog move forward, backward, or remain stationary?
⇒ forward
Explanation:
did it :)
12. What is the photoelectric effect, and what experimental evidence led scientists
to discover it? Does this support the wave or particle theory of light? Why?
Answer:
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
Explanation:
The effect is often defined as the ejection of electrons from a metal plate when light falls on it. In a broader definition, the radiant energy may be infrared, visible, or ultraviolet light, X-rays, or gamma rays; the material may be a solid, liquid, or gas; and the released particles may be ions (electrically charged atoms or molecules) as well as electrons. The phenomenon was fundamentally significant in the development of modern physics because of the puzzling questions it raised about the nature of light—particle versus wavelike behaviour—that were finally resolved by Albert Einstein in 1905. The effect remains important for research in areas from materials science to astrophysics, as well as forming the basis for a variety of useful devices.
The emission of electrons from the surface of a metal by the action of light is called photoelectric effect. This phenomenon indicates the behavior of light as particles called photons.
What is photoelectric effect ?The phenomenon of ejection of electrons from the surface of a metal when light of a suitable frequency falls on it is called photoelectric effect. Upon striking the surface of metals , light can set up an electric current which current which corresponds to the flow of electrons. This phenomenon is discovered by Einstein
For instance, visible light can cause ejection of electrons from the surface of metal like cesium which has low ionization enthalpy. This phenomenon is related to the observation that if light is considered as particles.
The particles of light is then called as photoelectrons or photons. Photoelectric effect find application in photoelectric cells used in colorimetry, spectrophotometers etc.
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explain why smoke particles in air move about faster if the temp of the air is increased??
Answer:
kinetic energy increases with the energy which causes the particles to move faster resulting in increases collision rates and rate of diffusion.
Explanation:
The increase in temperature of the air causes the air molecules to have more kinetic energy, which leads to more frequent and forceful collisions with the smoke particles. This, in turn, causes the smoke particles to move faster through the air.
What is kinetic energy?Kinetic energy is the energy an object possesses due to its motion. Any object that is in motion has kinetic energy, and the amount of kinetic energy it has depends on its mass and velocity.
The formula for calculating kinetic energy is:
KE = 1/2 × m × v²
where KE represents kinetic energy, m represents the mass of the object, and v represents the velocity of the object.
Here in the question,
Smoke particles in the air move around due to collisions with air molecules. When the temperature of the air increases, the average kinetic energy of the air molecules also increases. This means that the air molecules are moving faster and colliding more frequently with the smoke particles.
The smoke particles themselves do not have an increase in kinetic energy, but they do receive more energy from the collisions with the air molecules. This extra energy causes the smoke particles to move faster and more erratically, making them more dispersed throughout the air.
In addition, when air is heated, it becomes less dense. This means that there are fewer air molecules in a given volume of air. As a result, the smoke particles have more space to move around and collide with air molecules, which further contributes to their increased speed and movement.
Therefore, increasing the temperature of the air increases the speed and frequency of collisions between the air molecules and smoke particles, leading to the smoke particles moving faster and more widely dispersed throughout the air.
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Which unit of measurement is most appropriate for measuring the length of your computer screen?
Answer:
Inches or Centimeters
Explanation:
Inches or centimeters are the most appropriate units of measurement for the computer screen because they are in the form of whole figures that can be easily comprehended. Usually the width of computer screens span from 10 to 20 inches.
Conversion of a 15inches computer to meters;
1inch=0.0254meter
15inches= ?
15inches*0.0254/1
=0.381meters
The above is a very small figure which might be hard for most people to fathom or visualize.
a ball has the speed of 4.0 m/s and a kinetic energy of 16 joules. what is the mass of the ball?
Explanation:
[tex]ke = \frac{1}{2} m {v}^{2} \\ m = \frac{2ke}{ {v}^{2} } \\ = \frac{2 \times 16}{ {4}^{2} } = 2kg[/tex]
Which diagram shows a situation that would not produce an electric current in the wire?
Answer:B
Explanation:
A P E X
The diagram in which there is no current in the electric wire is B, the reason behind that it is not connected with the battery.
What is Electrical energy?When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible.
When two charge are in opposition to one another, they repel one another. The term "neutral" refers to an object has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand for taking into account quant phenomena.
Electrical charge is a preserved attribute, meaning that the net charged of an isolated system—that is, the sum of the positive and negative charges—cannot change. Particles at the subatomic level carry an electric charge.
The second diagram from the option will have no current in it because the wires are not connected with the battery, so the flow of current will not take place.
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A sound wave traveling through dry air has a frequency of 16 Hz, a
wavelength of 22 m, and a speed of 350 m/s. When the sound wave passes
through a cloud of methane, its wavelength changes to 28 m, while its
frequency remains the same. What is its new speed? (The equation for the
speed of a wave is v= f x.)
A. 350 m/s
B. 9,800 m/s
C. 450 m/s
D. 13 m/s
Answer:
C. 450
it should be right
The new speed of sound wave is 450 m/s. Hence, option (C) is correct.
What is sound wave?A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Pressure waves are produced when an object vibrates, such as a ringing phone, and these waves are known as sound waves.
Frequency of sound wave is = 16 Hz.
Wavelength of the sound wave is = 28 m.
Hence, new speed of sound wave is = 16 × 28 meter/second
= 448 meter/second
=450 meter/second. (approx.)
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During the formation of the aurora borealis, the electrons in an atom experience a change in energy levels. Which statement about this change is accurate?
First, the electron releases energy to move to a higher energy level.
First, the electron absorbs energy to move to a higher energy level.
First, the electron absorbs energy to move to a lower energy level.
First, the electron releases energy to move to a lower energy level.
Answer:
They are deflected as Earth’s magnetic field exerts force on them.
Explanation:
(Not for cheating, Just to help)
As solar wind approaches Earth, what happens to the charged electrons?
They are absorbed as Earth’s magnetic field exerts force on them.
They grow stronger as Earth’s magnetic field exerts force on them.
They grow weaker as Earth’s magnetic field exerts force on them.
They are deflected as Earth’s magnetic field exerts force on them.
First, the electron absorbs energy to move to a higher energy level.
A tennis ball launcher works by using a spring to
propel the ball forward.
One model of tennis ball launcher has
advertised that it is capable of imparting
15,000 J of kinetic energy to a 0.5 kg ball
initially at rest. A student carefully measures the
compression of the spring to be 0.10 m.
What is the value of the spring constant for the
tennis ball launcher according to the data
provided?
Answer:
3MN/m
Explanation:
Step one:
given data
Kinetic Energy KE=15,000J
mass m= 0.5kg
compression x= 0.1m
Step two:
The expression for the energy stored in spring is
[tex]KE= 1/2ke^2\\\\15000=1/2 *k*0.1^2\\\\15000=1/2*k*0.01\\\\15000=0.005k\\\\[/tex]
divide both sides by
0.005
[tex]k= 15000/0.005\\\\k=3000000\\\\k= 3MN/m[/tex]
From conservation of energy, the value of the spring constant for the tennis ball launcher according to the data is 3 x [tex]10^{6}[/tex] Nm
The work done by a tennis ball launcher by using a spring to propel the ball forward is equal to the kinetic energy which is 15,000 Joule. That is,
W = K.E
The given parameters are:
K.E = 15,000 J
Mass m = 0.5 kg
compression x = 0.1 m
The elastic potential energy on the spring will be equal to the work done by the tennis ball launcher. That is,
E = W
since W = K.E
E = K.E
1/2k[tex]x^{2}[/tex] = 1/2m[tex]v^{2}[/tex] = 15,000
1/2k[tex]x^{2}[/tex] = 15000
Substitute for 0.1 for x
1/2 K ([tex]0.1^{2}[/tex]) = 15000
[tex]0.1^{2}[/tex] K = 30000
K = 30000/0.01
K = 3 x [tex]10^{6}[/tex] Nm
Therefore, the value of the spring constant for the tennis ball launcher according to the data is 3 x [tex]10^{6}[/tex] Nm
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Does anyone get this? lol
Answer:
(a). 640.000 --- 6 significant figures.
(b). 2.0 --- 2 significant figures.
(c). 0.520200 --- 6 significant figures.
(d). 10.05 --- 4 significant figures.
(e). 10,000.0 --- 6 significant figures.
(f). 30.7 --- 3 significant figures.
(g). 0.00000065 --- 8 significant figures.
please please help
The law of conservation of charge states that the total charge remains the same after a transfer of electrons.
true or false
Answer:
true
Explanation:
The law of conservation of charge states that whenever electrons are transferred between objects, the total charge remains the same.
All of the following processes are the ones that lead directly to the formation of sedimentary rock EXCEPT-
deposition of rock fragments.
O
freezing of water in cracks in rock.
o
melting of rock deep underground.
movement of wind that carries earth material.
Answer:
melting of rock deep underground.
Explanation:
The melting of rocks deep underground does not produce sedimentary rocks. Most igneous rocks are produced by this process.
When molten rocks underground called magma is solidified in the subsurface, it results into the formation of igneous bodies.
Sedimentary rocks forms by the accumulation of sediments. Inside the basin where the sediments are deposited, they are compacted, cemented and lithified. Chemical and physical weathering of rocks produces sediments.9. Does a blackbody radiator emit light waves? Explain.
Answer:
"A blackbody is an object that absorbs all of the radiation that it receives(that is,it does not reflect any light,nor does it allow any light to pass through it and out the other side).The energy that the blackbody absorbs heats it up,and then it will emit its own radiation."
Explanation:
Risk*
plzz help.me with both questions
Explanation:
Primary cell
1. They are non-rechargeable.
2. The energy density of primary cells is more.
3. The internal resistance of primary cells is more.
4. Example : Zinc-Carbon cell.
Secondary cells
1. They are rechargeable cells.
2. The energy density of secondary cells is less.
3. The internal resistance of secondary cells is less.
4. Example : Car batteries
Current :
The flow of electric charge per unit time is called electric current. It can be given by the formula as follows :
[tex]I=\dfrac{q}{t}[/tex]
The SI unit of electric current is Ampere.
1 Ampere is defined as the current that flows with the electric charge of one Coulomb per second (C/s).
What is the speed of an object that travels 80 meters in 2 seconds?
a
160 m/2
b
0.04 m/s
c
40 m/s
Answer:
an object traveling 80 meters in 2 sec. is 160
How does work affect energy between objects so it can cause a change in the form of energy?
Sol
Work transfers energy.
O Work changes energy
O Work increases energy.
O Work decreases energy.
Answer:
Doing work' is a way of transferring energy from one object to another, energy is transferred when a force moves through a distance.
Explanation: So more energy, more work done bc u transferred more energy to move the object and doing the work. and if you only use a little of energy, the work done also only a little.
what do you understand by the term current state and define its SI unit.........
Answer:
Explanation:
Current refer to the rate at which electric charge flow or run or move in an electric circuit . It is measured in Ampere or coulumb per second.
The SI unit is Ampere and it is represented by A. It is a scalar quantity.
1 Ampere is the current that will produce an attractive force of 2 × 10^-7 Newton per meter of length between two parallel conductors.
B. Which of these uses the most power? Explain your answer.
1) 160 J of work in 8 seconds
2) 80 J of work is 4 seconds
3) 180 J of work in 9 seconds
Answer:
p=w/t
160/8=20
80/4=20
180/9=20
...so..all these uses equal power
Most metals have...
a. Atoms that are spread out, and low specific heats
b. Atoms that are close, and low specific heats
c. Atoms that are spread out, and high specific heats
d. Atoms that are close, and high specific heats
Between ball B and ball C, ball ____ has LESS potential energy because ___
a: c;its mass is greater
b: b;its mass is smaller
c: c; its mass is smaller
d: b;its mass is greater
Answer: b
Explanation:
Ec= (1/2)m × v^2
By the formula, you can see that the bigger the mass, the bigger the Cinetic Energy.
b: b; its mass is smaller
Between ball B and ball C, ball B has LESS potential energy because its mass is smaller.
A potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched.
Potential energy is given by formula.
[tex]P.E= m*g*h[/tex]
Since, P.E is directly proportional to mass. Thus, the ball having smaller mass will have the less P.E.
Thus, option b is correct.
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2 equal charges are kept at x=a and x=-a. there can be only 1 point where the electric field will be 0? how, can anyone explain?
Answer:
At the midpoint of the line joining the two equal charges
Explanation:
The midpoint of the line joining the two equal charges has equal distance from each charge. Since the charges are at x = a and x = -a, at the midpoint of the line joining the two equal charges, the magnitude of the electric field experienced as a result of each charge is the same. But these two fields are in opposite direction, hence the net resulting electric field would be equal to zero.
The image shows a type of fault.
What stress causes this type of fault to form?
A. Compression
B. Gravity
C. Tension
D. Shearing
Answer:
D. Shearing
Explanation:
D. Shearing
The Answer is: Shearing
Based on details in The Riddle of the Rosetta Stone, which statement best describes Jean-Baptiste Fourier's influence on Jean-François Champollion?
Answer:
hello your question is incomplete below is the missing part of the complete question
which statement best describes Jean-Baptiste Fourier’s influence on Jean-François Champollion? Fourier shared his research about mathematics with Champollion, which aided him in his research. Fourier was the first to introduce Champollion to the hieroglyphs on the Rosetta Stone, which fascinated him. Fourier shared his findings about the Rosetta Stone with Champollion, which helped him in his research. Fourier was the first to introduce Champollion to a variety of languages, which prompted his love of languages.
answer : Fourier was the first to introduce Champollion to a variety of languages, which prompted his love of languages.
Explanation:
Jean-Baptiste Fourier's influence on Jean-Francois Champollion is that Fourier was the first to introduce Champollion to a variety of languages, which prompted his love of languages. also Fourier was a mathematician who pleaded on the behalf of Champollion when he was about to be adopted into the military.
Using the information given, find the number of Electrons of the unknown element: 6 PROTONS, 6 NEUTRONS, 12 ATOMIC MASS
Answer:
the answer is 24 you are correct
Explanation:
the ratio of the rise to the run of a line on a graph (steeper line = faster speed)
How are the molecules in a gas different from molecules in other states of matter?
Answer: The molecules in gases are different from other states of matter
Explanation:
The molecules in gases are different from other states of matter because unlike, for example, a solid, they move around freely and are much more spread apart. A gas can fill up any container, but once the container is unsealed, the gasses will immedietly be let out. Gases can be compressed much more easily than a solid or a liquid.
50 Points!
1. How does the speaker know that the lump of metal she is holding is an asteroid?
2. How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
3. Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
4. Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
Answer:
How does the speaker know that the lump of metal she is holding is an asteroid?
The patterns formed inside the metal She explains that the rock is older the earth and that it is an asteroid due to the patterns formed inside it that show it contains metallic crystals that cannot be formed on earth but in space where temperatures mean that molten metal takes billions of years to cool.
How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
The speaker works with astroids she attempts to search for them for scientific use. She analyzes how long ago these rocks were coming acrost the earth. How many are in the universe.
Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
Debris from the impact orbiting around the Earth shielded sunlight, halting photosynthesis.
The impact was so extreme that life at ground zero was vaporized.
tsunamis, landslides, earthquakes, and heat caused by the impact killed organisms near the site of impact.
Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
It seems as if she does agree. I believe she has strong intentions to defend the earth and to prevent there to be any more extinction for any more animals I believe she cares to explore and recover so if she could find a way to use the asteroids to her advantage she would.
Explanation:
6. How does the speaker know that the lump of metal she is holding is an asteroid?
- The speaker knows that the lump of metal she is holding is an asteroid because the patterns formed inside the metal. She explains that the rock is older than the earth and that it is an asteroid. This is due to the patterns formed inside it. These patterns show that it contains metallic crystals that cannot be formed on earth, but instead in space where temperatures mean that molten metal takes billions of years to cool. The scientists also use representative sampling. This is done when they deal with such large quantities of objects for estimating.
7. How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
- The speaker “hunts” for asteroids by attempting to search for them for scientific use. She analyzes how long ago these rocks were coming across the earth and how many are in the universe. She also is classifying them by color and shape. Some of the objects can be classified into one or more categories and this could lead to disagreements on where they should or should not be listed. Also, the objects can be difficult to see properly.
8. Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
- The asteroid hit at high velocity and effectively vaporized. It made a huge crater, so in the immediate area there was total devastation. A huge blast wave and heatwave went out and it threw vast amounts of material up into the atmosphere. 'It sent soot travelling all around the world.
9. Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
- I would say that it seems to me as though she does agree. I believe she has strong intentions to defend the earth and to prevent any more extinctions for any more animals. I believe she cares to explore and recover in order to hopefully help find a way to use asteroids to her advantage. On top of that, the object shown is an Irregular galaxy. This can be determined by the fact it has an irregular shape.
A laser beam is directed at the Moon, 380,000 km from the Earth. The beam diverges at an angle of \thetaθ of 0.8 x 10-5 rad. What diameter spot, in m, will it make on the Moon?
Answer:
3040 m
Explanation:
The formula to apply here is ;
d=∅*r where
d is the diameter of the spot , ?
∅ is angle of divergence in radians, = 0.8 * 10⁻⁵rad
r is distance of Moon from Earth, =380,000 km
Applying the formula as;
d=∅*r
d= {0.8 *10⁻⁵} * 380,000 * 1000
d= 3040 m
If a police car is travelling towards you what effect does this have on the police
siren?
Answer:
well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking
Explanation: