The watt•second is a unit of

(1) power

(2) energy

(3) potential difference

(4) electric field strength

Most metals are not magnetic but iron is why?

An object has a mass of 5kg. What force is needed to accelerate it at 6 m/s2

If a fuse or circuit breaker directly opens a circuit when the current limit is reached, do overload heaters open and break the circuit when their current limit is reached?

Calculate the total energy of 4.0 kg object moving horizontally at 20 m/s 50 meters above the surface.

A source of sound is detected in the middle of a room. Which can account for a decrease in sound intensity for an observer?

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall