Why dont we use a power water engine

The diagram shows a wave. the quantity shown is the amplitude. this quantity is directly proportional to which of these other quantities? a) energy b) frequency c) period d) wavelength

What is the displacement of an object that starts at the origin and moves to position -8 m? (show all work)

The velocity of a car traveling in a straight line increases from 0 meters/second to 30 meters/second in 8 seconds. what is the average acceleration of the car? a. 3.75 meters/second b. 3.75 meters/second2 c. 0.27 meters/second2 d. 0.27 meters/second