What is the work done by gravity when a 2.0kg ball falls to the floor from the height of 1.50m? Is it positive or negative? Explain

Find the peak electric field 1.3 m from a 60-w lightbulb that radiates equally in all directions.

Index fossils are the remains of species that were once abundant and

Imagine that you are approaching a black hole in a spacecraft. What would you see? What would happen to you?

light beam is directed parallel to the axis of a hollow cylindrical tube. When the tube contains only air, the light takes 8.72 ns to travel the length of the tube, but when the tube is filled with a transparent jelly, the light takes 1.

A proton in an accelerator attains a speed of 0.772c. what is the magnitude of the momentum of the proton?

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?