Am1 = 5.1 kg ball moving at v1 = 7.4 m/sec collides with a m2 = 1.02 kg ball at rest. the balls bounce off each other and the second ball moves in the same direction as the first ball at 11.4 m/sec. what is the velocity v2 of the first ball after the collision?

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.