What is the drift rate of the pacific plate over the hawaiian hot spot?

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What are similarities and differences of reflection, refraction, diffraction and absorption?