A ball rolls down from the top of a grassy hill, reaches the bottom of the hill, continues to roll, and then starts to slow down and comes to a stop. What forces caused this ball's motion?

How long did it take for the Moon to go around Earth?

The description for a certain brand of house paint claims a coverage of 475 ft²/gal. (a) Express this quantity in square meters per liter. (b) Express this quantity in an SI unit. (c) What is the inverse of the original quantity?

Will two separate 50db sounds together constitute a 100db sound explain mathematical

Which statement does not correctly describe a theory? A. It is based on scientific evidence. B. It can be used to make predictions. C. It can be modified as new discoveries are made. D. It is directly testable.

Waves on a swimming pool propagate at 0.423 m/s. You splash the water at one end of the pool and observe the wave go to the opposite end, reflect, and return in 37.7 s. How far away is the other end

A geologist estimates that a large boulder weighs 7840 N. What should he estimate the mass of this boulder to be? A. 650 kg B. 740 kg C. 780 kg D. 800 kg

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.

If you keep voltage constant and increase resistance resistance, what happens to current?

A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on his back, but a researcher has been hired to investigate the safety of this stunt.

During energy transformation, all energy systems: are a. 100 percent efficient b. lose energy c. gain heat energy d. create energy