A skier going down a mountain has 98,000J of gravitational potential energy, 10,000J of kinetic energy and 2,000J of thermal energy. At the bottom of the mountain, he has 90,000J of kinetic energy. How much thermal energy does he have at the bottom of the mountain? A) 2,000J B) 8,000J C) 20,000J D) 80,000J

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

=force × distance a. work b. velocity c. pressure d. momentum

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.