The force tat one surface exerts on another when the two rub against each other is called?

A proton's rest mass is 1.67 Ã 10â27 kg. calculate its total energy if it is accelerated to a speed of 0.66 c. answer in units of j

Squaw Valley ski area in California claims that its lifts can move 49800 people per hour. If the average lift carries people about 190 m (vertically) higher, estimate the maximum total power needed. (Assume an average mass per person of 70 kg.) W

The force of an apple hitting the ground depends on

How do I determine which object has the greatest acceleration?

A skier on a hill has 4000J of kinetic energy and 3000J of potential energy. After sliding down the hill a ways, their potential energy is 2000J.

When you stack three flashlight batteries in the same direction, you get a voltage of 3*1.5 volts = 4.5 volts. What voltage do you get if one of the batteries is turned to face in the opposite direction? a) 0 volts b) 1.5 volts c) 3 volts d) - 4.

If an ant were scaled up to the size of an elephant, the ant would be

A 4.0 kg food pack was dropped from a height of 200 m by a helicopter during flood relief operations. At what velocity will the food pack be falling halfway to the ground?

The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true? The mechanical waves reach Earth, while the electromagnetic waves do not.

A 3-kg mass is in free fall. What is the velocity of the mass after 7 seconds?