A baseball. 167 grams, is pitched at 50 m/s when is hit by the batter. The ball travels in the
opposite direction it was thrown from with a speed of 70 m/s. What is the change in momentum
of the baseball?

State the right hand rule of the direction of magnetic field in a conductor carrying current

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.