What must exist for electric charges to flow?

electric potential or electric potential difference

What physical law (s) predicts the conservation of momentum?

When aluminum-27 is bombarded with a neutron, a gamma ray is emitted. what radioactive isotope is produced?

Which variable is changed in an experiment? A. The Stable Variable B. The Graphing Variable C. The Independent Variable D. The Dependent Variable

What is the main difference between a refracting telescope and a reflecting telescope

A rectangular current loop is located near a long, straight wire that carries a current of 12 A. The current in the loop is 25 A. Determine the magnitude of the net magnetic force that acts on the loop.

What role do volcanoes play in the flow of energy and cycling of matter on earth?

How does uniform linear motion differ from uniform circular motion?

A metal underground water pipe that is in direct contact with the Earth for? or more is a code-recognized as a grounding electrode and must be included in the grounding electrode system.

Bob has been Springfield's top meteorologist for ten years. He received data from satellite imaging and computer models that a huge storm system is headed Springfield's way.

A person runs off a cliff into a lake below. If the person leaves the cliff without a horizontal velocity of 4m/s, how far way from the cliff does he land is the cliff is 17m high?