Which of the following statements is true?
a. Newton's laws cannot be made to work in accelerated reference systems.
b. Newton's laws work in all systems, including accelerated reference systems.
c. Newton's laws work in accelerated reference systems if inertial forces are included.
d. The fictitious forces cannot be used because they are not real.
e. Newton's first law fails in an accelerated reference system, but the second and third laws do not.
c
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How many protons should be added to the nuclei of oxygen atoms so the resulting gas will glow red when an electric current is in it?
A) 1 B) 2 C) 3 D) 4 E) none of the above
Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?
A) The cloud is extremely hot. B) The cloud is visible primarily because it reflects light from nearby stars. C) The cloud is cool and very dense, so that you cannot see any objects that lie behind it. D) The cloud is cool and lies between you and a hot star.
John's mass is half the mass of Jill. They both start walking and John moves twice as fast as Jill. What is the ratio of the kinetic energy of Jill to the kinetic energy of John?
A) 4 B) 2 C) 1 D) 1/2 E) 1/8
Muller wears a wristwatch with tritium in the watch hands because
A. he is not worried about radioactivity B. tritium is not radioactive C. the levels of radiation that emerge are safe D. no radiation emerges from the watch hands