Author Question: A proton is first accelerated from rest through a potential difference V and then enters a uniform ... (Read 123 times)

mia · **on:** Jul 29, 2018

A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path. In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm.

What was the potential difference V? (mproton = 1.67 10-27 kg, e = 1.60 10-19 C)

Question 2

A rock is dropped from rest off of a high cliff on another planet, planet X. There is no atmosphere, and thus no air resistance, on planet X. At the end of 1 second, the rock is moving at a speed of 6 m/s.

At the end of 2 seconds, it is moving at 12 m/s. How fast will the rock be moving at 4 seconds after being dropped?
A) 20 m/s B) 40 m/s C) 24 m/s D) 18 m/s E) 36 m/s