What is Precambrian time?

How much current is in a circuit that includes a 9.0-volt battery and a bulb with a resistance of 4.0 ohms?

Is it true or false that a group of animals limits the species of plants that grow in an area.

imagine that you are on a spaceship that is far from the sun or any planet. Explain why a 500 kg piece of equipment would be difficult to move, even though the object would be weightless?

What is am example of conduction

A biological cycle, or rhythm, that is approximately 25 hours long is called

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?