Because after each impact it loses a fraction of its original energy, because it gets transfered to the floor. this is the reason that a perpetual motion machine is impossible. you cannot have infinite energy, because to perform a task, energy must be spent. hope i helped :3
Answer:
gas
Explanation:
gasoline will never freeze up
Answer:
a)
s
b) 3.41 mm
Explanation:
a)
We take the speed of light, c =
m/s and the refractive index of glass as 1.517.
Speed = distance/time
Time = distance/speed
Refractive index, n = speed of light in vacuum / speed of light in medium
![n=\dfrac{c}{s}](https://tex.z-dn.net/?f=n%3D%5Cdfrac%7Bc%7D%7Bs%7D)
![s=\dfrac{c}{n}](https://tex.z-dn.net/?f=s%3D%5Cdfrac%7Bc%7D%7Bn%7D)
![t=\dfrac{d}{c/n}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7Bd%7D%7Bc%2Fn%7D)
![t=\dfrac{dn}{c}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7Bdn%7D%7Bc%7D)
![t=\dfrac{3\times10^{-3}\times1.517}{3.0\times10^8}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7B3%5Ctimes10%5E%7B-3%7D%5Ctimes1.517%7D%7B3.0%5Ctimes10%5E8%7D)
![t=1.517\times10^{-11}](https://tex.z-dn.net/?f=t%3D1.517%5Ctimes10%5E%7B-11%7D)
b)
We take the refractive index of water as 1.333.
Speed in water = speed in vacuum / refractive index of water
Distance = speed * time
![d=s\times t](https://tex.z-dn.net/?f=d%3Ds%5Ctimes%20t)
![d=\dfrac{c}{n_w}\times \dfrac{3\times10^{-3}\times1.517}{c}](https://tex.z-dn.net/?f=d%3D%5Cdfrac%7Bc%7D%7Bn_w%7D%5Ctimes%20%5Cdfrac%7B3%5Ctimes10%5E%7B-3%7D%5Ctimes1.517%7D%7Bc%7D)
![d=\dfrac{3\times10^{-3}\times 1.517}{1.333}](https://tex.z-dn.net/?f=d%3D%5Cdfrac%7B3%5Ctimes10%5E%7B-3%7D%5Ctimes%201.517%7D%7B1.333%7D)
d = 3.41 mm
There are two ways to find energy. Energy=F*d=mv^2. We can use this relationship to find v: