Which of the following changes would not change the energy of the roller coaster car?

increasing the volume of the rollercoaster car

increasing the height of the starting point of the rollercoaster car

increasing the speed that the rollercoaster car is traveling

Which object has more thermal energy: a large pot of water or a small pot of water at the same temperature?

The large pot has more thermal energy.

Both pots have the same thermal energy.

The small pot has more thermal energy.22

A cold can of soda is taken out of the refrigerator. It slowly warms up until it is at room temperature. Once the soda has warmed up, it has more thermal energy than it had in the refrigerator. Where did this additional thermal energy come from?

The additional thermal energy came from the air in the room.

The additional thermal energy was already in the soda.

The additional thermal energy came from the refrigerator.

A student drops a ball from five feet above the ground. After bouncing once, it reaches a maximum height of 157 cm above the ground. The following diagram shows the maximum height the ball reaches after consecutive bounces. Does the bar graph contradict the idea of energy conservation? Why or why not?

No. The kinetic energy of the ball decreases, but the total amount of energy of the ball and the surroundings remains constant.

Yes. Since the height of the bounces is decreasing, that shows that the energy in the system is not conserved.

Have you ever wondered where the energy that you use in your house comes from? Well, the answer is that it comes from several different sources. Natural gas and coal are the two major sources of energy that power plants use to make our electricity. In this section we will take a deeper dive into how electricity is produced by a coal power plant, using the diagram as a guide. The process begins when coal is mined from the ground. Coal is a black sedimentary rock with an interesting property -- it can be set on fire to release energy! The coal that is mined is taken to a power plant. At the power plant, the coal is burned, which releases incredible amounts of heat. This heat then creates steam that turns turbines. These turning turbines are then able to transfer energy to generators, which create electricity. When coal is burned to produce heat, which energy transformation is occurring?

Chemical energy transforms into thermal energy.

Chemical energy transforms into elastic energy.