How much rope would need to be pulled through a pulley with a mechanical advantage of 2 to lift a load 4 ft?

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Why can't conductors generate static electricity when rubbed together?

A car starts from rest and speeds up at a constant rate of 2.03 m/s^2 in a straight line until it reaches a speed of 21.1 m/s. The car then slows down at half the rate that it sped up until it stops.

Nerve signals in the body occur when a small voltage, called an action potential, is applied across the membrane of a cell.

When a tennis ball is dropped onto a tennis court from a height of h the ball rebounds to a height of 3 5 h feet.

A machine called a centrifuge is used in

Suppose the skin temperature of a naked person is 34°C when the person is standing inside a room whose temperature is 26°C. The skin area of the individual is 1.2 m2. (a) Assuming the emissivity is 0.

Which of the following is NOT a way to increase energy efficiency? a. putting insulation in your home c. using public transportation b. recycling d. using low heat lightbulbs

A 20kg child lifts his 0.5kg ball of the floor to put it away on his bookshelf 1.5 meters above the ground. How much work has he done?

When you touch a hot object, a reflex controls your movements. but how do you know the object was hot?