Which of the following causes a current in an electrical circuit?

A. resistance

B. a current difference

C. a voltage difference

D. the shape of the electrical circuit

How is it possible for an object to have an increasing speed but a decreasing acceleration?

Workers load a 500kg safe onto an elevator that lifts it 90m to the twentieth floor of a building. How much work did the elevator do on the safe?

A swimmer jumps from a waterfall thats is 8.5 m high from the lake below. How fast must he run horizontally to dive 2.5m away from the base of the waterfall?

How do modern scientists describe the make up of matter

Forces that affect objects without touching them are called field forces. Is gravity a field force? Explain.

A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N.

Which type of radiation has the lowest penetrating ability?

For which one of the following situations will the path length equal the magnitude of the displacement? a A ball on the end of a string is moving in a vertical circle. b A toy train is traveling around a circular track.

A poem on the body system

How many stars, approximately, are in the solar system?