Which of the following diagrams correctly illustrates the movement of thermal energy between metal cubes?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

What do we mean by the event horizon of a black hole?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.