A5.10-kg watermelon is dropped from rest from the roof of a 24.0-m -tall building and feels no appreciable air resistance.
calculate the work done by gravity on the watermelon during its displacement from the roof to the ground.
part a
calculate the work done by gravity on the watermelon during its displacement from the roof to the ground.
part bjust before it strikes the ground, what is the watermelon's kinetic energy?
part cjust before it strikes the ground, what is the watermelon's speed?
part dwould the answer in part a be different if there were appreciable air resistance?

The density of gold is 19.3g/cm3. what is the volume of a 13 g gold nugget? ( density: d= m/v)

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603