Consider a conducting rod of length 28cm moving along a pair of rails, and a magnetic field pointing perpendicular to the plane of the rails. At what speed (in m/s) must the sliding rod move to produce an emf of 0.75V in a 1.75T field?

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?