Author Question: A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field. ... (Read 53 times)

cmoore54 · **on:** Jul 28, 2018

A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field. When it has completed one fourth of a revolution, what is its kinetic energy?
a. 1.4 E
c. E
b. 0.71 E
d. The value is not given.

Question 2

Water pressurized to 4 105 Pa is flowing at 5.0 m/s in a pipe which contracts to 1/3 of its former area. What are the pressure and speed of the water after the contraction? (density of water = 1 103 kg/m3)
a. 2 105 Pa, 15 m/s
c. 3 105 Pa, 15 m/s
b. 3 105 Pa, 10 m/s
d. 4 105 Pa, 1.5 m/s