31. A narrow beam of protons produces a current of 1.6 x 10- A. There are 10 protons in each meter along the beam. Of the following, which is the best estimate of the average speed of the protons in the beam?
(A) 10-15 m/s
(B) 10-12 m/s
(C) 10-7 m/s (D) 10 m/s

Identify the forces that contribute to the centripetal force on the object in each of the following examples: a. a bicyclist moving around a flat, circular track b. a bicycle moving around a flat, circular track c. a racecar turning a corner on a steeply banked curve

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?