Suppose you stretch a rubber band. The work you do on the rubber band is
A. positive.
B. negative.
C. zero.
A. positive.
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Which of the following indicates that the Sun must be gas from its surface to its center?
A) Its low density and high temperature B) Its limited gravitational force C) Its hot spots on the photosphere D) Its weak magnetic field and small diameter
In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls
If the physical situation is portrayed correctly, from the vantage point of an observer at the top of the cliff leaning over the edge, the pitch of the scream as he falls should be A) lower than the original pitch and constant. B) higher than the original pitch and increasing as he falls. C) higher than the original pitch and constant. D) lower than the original pitch and decreasing as he falls. E) It is impossible to predict.
For an atom of hydrogen where the quantum number n = 3, how many possible independent configurations of the atom exist (consider principal quantum number n, angular momentum quantum number l, magnetic quantum number ml, and magnetic spin quantum number ms)?
Refer to the race described above. According to Ben, what happens?
A) The light beam gradually pulls ahead of him and wins the race because it is going 1 percent of the speed of light faster than him. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam moves out ahead of him at the full speed of light, winning the race easily. D) Ben wins the race and becomes a hero.