When a 100-kg astronaut ejects 0.1 kg of gas at a speed of 50 m/s from her propulsion pistol, her recoil speed is

The power expended for a barbell raised 2.0 m in 2 s is

An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level

A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance. When it returns to its initial level its kinetic energy is

Work is done by gravity on a bowling ball that rolls

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be

A given net force propels an object along a straight-line path. If the mass were doubled, its acceleration would

If there were no gravity, a ball thrown upward at an angle would follow a straight-line path. Due to gravity, however, at the end of 2 s it is

A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

With no air resistance, a projectile fired at 60° has the same range as if it were fired at