A machine has a velocity ratio of 5 and a mechanical advantage of 4. the system is used to raise a load of 500N through 10m. the wested energy is A,6250 J C,5000J
B,1250J D,12500J
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A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic