In an energy diagram, what does the difference between the energy line and the potential energy line represent?
A. Change of thermal energy
B. Energy leaving the system
C. All of these are correct.
D. Kinetic energy
Ans: D. Kinetic energy
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Earth is made mostly of metals and rocks. Where did this material come from?
A) It was produced in the Big Bang. B) It was created by chemical reactions in interstellar space. C) It was produced by the nuclear fusion in stars that made the heavy elements. D) It was made by our Sun. E) It was made by nuclear fission of uranium and other radioactive materials.
As a falling object's gravitational potential energy decreases:
a. its kinetic energy decreases. b. its kinetic energy increases. c. its total mechanical energy increases. d. its kinetic energy remains the same. e. it falls more slowly.
What is the best time to see the corona? Why is it so faint, if it is so hot?
What will be an ideal response?
The ____ produce(s) tides on the Earth
a. Moon alone b. Sun alone c. Moon and Sun