If the particle is sent back through the magnetic field (along the same initial path) but with 3.87 times its previous kinetic energy, how much time does it spend in the field during this trip?

An observer that stands still as the electron moves by him, will observe

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.