Two identical balls collide one was initially at rest. after the collision one of the balls has a velocity of 3 m/s south. the other has a velocity of 4 m/s west. what was the velocity of the ball that was moving before the collision

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

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.