Answer:
C. Electromagnetic waves are longitudinal waves
Explanation:
C)a seated passenger on the train
low speed Galilean relativity
Kinetic, thermal and electrical. There is more then one form of energy
The centripetal acceleration is given by:
![a_c = \frac{v^2}{r}](https://tex.z-dn.net/?f=a_c%20%3D%20%20%5Cfrac%7Bv%5E2%7D%7Br%7D%20)
where
v is the velocity of the object
r is the radius of the trajectory
Initially, the car has an acceleration of
![a_c = 20 m/s^2](https://tex.z-dn.net/?f=a_c%20%3D%2020%20m%2Fs%5E2)
and the radius of its trajectory is
![r=5 m](https://tex.z-dn.net/?f=r%3D5%20m)
, so its velocity is
![v= \sqrt{a_c r}= \sqrt{(20 m/s^2)(5 m)} =10 m/s](https://tex.z-dn.net/?f=v%3D%20%5Csqrt%7Ba_c%20r%7D%3D%20%5Csqrt%7B%2820%20m%2Fs%5E2%29%285%20m%29%7D%20%3D10%20m%2Fs%20)
Then the radius is increased to r=10 m, so the new centripetal acceleration is:
And object has mass, so if moving, has a momentum value.