Work-Energy Theorem: A stone is moving on a rough level surface. It has 24 J of kinetic energy, and the friction force on it is a constant 0.50 N. What is the maximum distance it can slide?
A. 2.0 m
B. 12 m
C. 24 m
D. 48 m
Answer: D
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Quantum uncertainties are the source of
A) the unpredictability of radioactive decay. B) the unpredictability of games of chance such as flipping coins. C) Both of the above. D) None of the above.
Root Wedging
What will be an ideal response?
Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it. B) It plays a crucial role in nuclear fusion in the Sun. C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers. D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.
Which of the following is an important starting assumption in models of galaxy formation?
A) All galaxies start out as spiral galaxies. B) Some regions in the universe start out denser than others. C) Black holes form first, seeding the formation of galaxies. D) Galaxies form first, then black holes.