Answer is 12 milesBecause yeah
This is hard sorry but I need to anwser
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
Answer:
<u>The pendulum bob swing past the mean position because:</u>
When a pendulum's bob is accelerating at its extreme position its velocity is zero. Due to the restoring toque the bob starts to accelerates towards its mean postion. The maximum acceleration of the pendulum's bob is
and the the acceleration decreases as
towards the mean position.
The acceleration at the mean position becomes zero but the velocity remains maximum. Hence the bob continues to move and does not stops.Thus it can summarised as the force decreases ,acceleration decreases and velocity increases at slow rate.