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Power is defined as the

If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the total time to return to its starting position is

After rolling half-way down an incline, a marble’s kinetic energy is

At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is

When a rocket ship gaining speed in remote, gravity-free outer space runs out of fuel, it

While driving down the highway a lovebug spatters onto your windshield. Which experiences the greater force of impact?

The International Space Station orbits at an average 360-km altitude so that it is mainly above Earth’s

An huge bear and a leaf fall from a tree through the air to the ground below. The force of air resistance is greater on the

A 2-kg rifle is horizontally suspended by a pair of strings so that recoil can be measured. The rifle fires a 0.001-kg bullet at a speed of 200 m/s. The recoil velocity of the rifle is about

A hunter fires a bullet from a horizontally—held rifle while simultaneously dropping another bullet from the side of the rifle. The bullet to hit the ground first is