A student swings his keychain around in a circle. What is the source of the centripetal force for this action?

The yearly rainfall in the rainforest is between 50 - 260 inches? id weather or climate

A man pulls on his dogs leash to keep him from running after the bicycle. Which term best describes this example?

For part A (steel projectile), compute the total kinetic energy before and immediately after impact (show your work).

Based on the second law of thermodynamics why must a machine always be less than 100% efficient? A. Heat never moves from cold to hot. B. Heat is never converted completely into mechanical energy. C. Heat never flows from hot to cold. D.

Water is pumped from a lower reservoir to a higher reservoir by a pump that provides 20 kW of shaft power. The free surface of the upper reservoir is 45 m higher than that of the lower reservoir. If the flow rate of water is measured to be 0.

A 500 kg table with 4 legs rests on solid flat ground. I place 3 books on the center of the table with masses of 10 kg, 20 kg and 30 kg respectively. What is the normal force between the ground and one leg of the table?

Fluorine-21 has a half-life of approximately 5 seconds. What percentage of the original nuclei would remain after 20 seconds

Which of these is an example of a totalitarian regime A.) Canada under prime minister Trudeau's rule B.) the Soviet Union under Josef lo

Since 1 pound = 4.45 newton, what is your earth weight in newtons?

A girl moves at 2m/s delivering newspapers. she throws a newspaper directly behind her at 2m/s. in the frame of reference of someone standing nearby what is the motion of the newspaper.