A radio transfers 270 J of energy electrically, 94.5 J is transferred by sound. Work out the efficiency of this radio. Give your answer as a decimal.

Electrical devices have resistance because they

A football is kicked vertically upward from a height of 2 feet with an initial speed of 70 feet per seconds.

Ludo doesn't believe in cheating on school work, but then he took a French test and everyone else was cheating, so he did it, too. Now, he tells himself that cheating is usually bad, but sometimes it is O. K. This is an example of:

Which form of nitrogen can immediately be used by plants

The capacitors in each circuit are fully charged before the switch is closed. Rank, from longest to shortest, the length of time the bulbs (resistors) stay lit in each circuit.

Water soaks down into the ground in a process known as A. infiltration B. precipitation C. transpiration D. condensation

Forensic Odontologists look at number of teeth, tooth development and tooth degeneration to determine A) age B) ancestry C) weight D) height

How is kinetic energy related to the distance

If gravity is not a force how does it accelerate objects?

How many DNA strands could you fit into a milimeter