Which of the following is an example of electrical energy being converted to chemical energy?

a. a storage battery is charged using an electric current.
b. an electric furnace begins to emit heat to warm a house.
c. the wheels on a machine begin to turn and move a conveyer belt.
d. a loudspeaker, which is plugged in to the wall, begins to project sound.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

What are the north and south poles of a solenoid change with?