An electrician wraps rubber electrical tape around a copper wire. since rubber is an insulator, which statement best explains the point of wrapping rubber around a copper wire? a) rubber stops charges from flowing. this protects people by stopping electricity from flowing. b) charges flow better through the rubber. this makes electricity flow better through the wire. eliminate c) the rubber tape keeps the wire from falling apart. d) the rubber keeps the copper wire from melting.

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?