Yeah, it's every state. Atoms need a certain quanta of energy to jump to each state of energy, and therefore change state depending on how much energy is absorbed and/or released. This applies to all states of matter.
<span>It takes heat to make something evaporate, so it takes heat from your arm. Alcohol easily evaporates at room temperature, so it feels cool. This is also why you feel cool when getting out of the pool. The water on your skin evaporates.
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Answer:
12m/s
Explanation:
Given parameters:
Power = 6.5 x 10⁴W
Force = 5.5 x 10³N
Unknown:
The resulting velocity = ?
Solution:
The velocity of a body is related to force and power using the expression below;
Power = Force x velocity
Insert the parameters and solve for velocity
6.5 x 10⁴ = 5.5 x 10³ x velocity
velocity =
= 12m/s
Using the formula F = m*a. where F is the force, m is the mass and a is the acceleration you can use it for each. As long as there are no other forces towards the body in both cases :
F = m*a
F = 50*3
F = 150 N
Answer:
![PE=81.755\, J](https://tex.z-dn.net/?f=PE%3D81.755%5C%2C%20J)
Explanation:
Given that:
- mass of meteoroid,
![m=7.8\times 10^8 \,kg](https://tex.z-dn.net/?f=m%3D7.8%5Ctimes%2010%5E8%20%5C%2Ckg)
- radial distance from the center of the planet,
![R= 2.8\times 10^7 m](https://tex.z-dn.net/?f=R%3D%202.8%5Ctimes%2010%5E7%20m)
- mass of the planet,
![M=4.4\times 10^{25}\, kg](https://tex.z-dn.net/?f=M%3D4.4%5Ctimes%2010%5E%7B25%7D%5C%2C%20kg)
<u>For gravitational potential energy we have:</u>
![PE=G\frac{M.m}{R}](https://tex.z-dn.net/?f=PE%3DG%5Cfrac%7BM.m%7D%7BR%7D)
substituting the respective values:
![PE=6.67\times 10^{-11}\times \frac{4.4\times 10^{25}\times 7.8\times 10^8}{2.8\times 10^7}](https://tex.z-dn.net/?f=PE%3D6.67%5Ctimes%2010%5E%7B-11%7D%5Ctimes%20%5Cfrac%7B4.4%5Ctimes%2010%5E%7B25%7D%5Ctimes%207.8%5Ctimes%2010%5E8%7D%7B2.8%5Ctimes%2010%5E7%7D)
![PE=81.755\, J](https://tex.z-dn.net/?f=PE%3D81.755%5C%2C%20J)