A75.0 kg man is riding an escalator in a shopping mall. the escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.60m. what is the work done on the man done by gravitational force?

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter

Decreased sensitivity to an unchanging stimulus is known as