Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. How much power does the elevator use?

Compared with an empty ship, the same ship loaded with Styrofoam will float

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12 m/s collides with it and they both stick together and move at a speed of

An archer shoots an arrow. If the action force is the bowstring on the arrow, the reaction is the

A straw is used for a pea shooter. When you blow through the straw the speed of the emerging pea will be greater if the straw is

A heavy rock and a light rock in free fall have the same acceleration because the

If there were no gravity, a cannonball fired upward at 45° would follow a straight-line path. Due to gravity, however, at the end of 3 s it is

An important condition for the operation of the Falkirk Wheel is that

The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is