3. How are fossil fuels used to generate electrical energy? A Heat from burning fuel spins magnets inside an electric motor.
B Heat from burning fuel creates steam that spins a turbine.
C Heat from burning fuel creates steam that turns a transformer.
D Heat from burning fuel causes an electric motor to produce a current.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.