A basketball player lands on the ground after dunking the ball. Is the work done on the player by the contact interaction between the player and ground positive, negative, or zero?
A. Positive
B. Negative
C. Zero
D. One needs more information to answer.
C. Zero
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An ice cube at 0°C is placed in a very large bathtub filled with water at 30°C and allowed to melt, causing no appreciable change in the temperature of the bath water. Which one of the following statements is true?
A) The entropy gained by the ice cube is equal to the entropy lost by the water. B) The entropy lost by the ice cube is equal to the entropy gained by the water. C) The net entropy change of the system (ice plus water) is zero because no heat was added to the system. D) The entropy of the system (ice plus water) increases because the process is irreversible. E) The entropy of the water does not change because its temperature did not change.
How do we expect that the first Earth-sized extrasolar planets will be discovered (if they exist)?
A) by the transit technique from an observatory in space B) with photographs from a new generation of large, ground-based observatories C) by NASA's Terrestrial Planet Finder mission D) by the Doppler technique
What is stellar parallax?
A) It is the daily rise and set of the stars. B) It describes the fact that stars are actually moving relative to one another, even though to our eyes the stars appear fixed in the constellations. C) It is the slight back-and-forth shifting of star positions that occurs as we view the stars from different positions in Earth's orbit of the Sun. D) It is the change in the set of constellations that we see at different times of year in the evening sky.
When star light passes by the sun
A) it is unaffected by the sun. B) it is deflected away from the sun. C) it is deflected toward the sun. D) it is absorbed by the sun.