A heat engine takes in 500 J of energy from the hot reservoir in one cycle while performing 100 J of work. The amount of heat transferred to the cold reservoir in the same time is
A. 400 J.
B. zero.
C. 500 J.
D. 300 J.
E. 200 J.
Answer: A
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What is the molecular formula for benzene?
a. C6H6 b. C6H12 c. C6H14 d. C6H8 e. None of these
If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years, what would we see happen?
A) Stars will move through the spiral arms, bunching up closer as they pass through. Young hot stars will form and die within the arms before having a chance to move out. B) The spiral arms will seem to "wind up," wrapping more and more tightly around the center of the Galaxy. C) The spiral arms will quickly dissipate and fade away, because they are a temporary phenomenon that should only last for a million years or so. D) The spiral arms will eventually unwind, as centripetal forces send the stars flying outward into intergalactic space.
A cable is 100 m long, has a cross-sectional area of 1.0 mm2, and is made of a material having a Young's modulus of 1.0 × 1011 N/m2. If a 1000-N force is applied to stretch the cable, how far does it stretch?
A) 0.0010 m B) 0.010 m C) 0.10 m D) 1.0 m E) 10 m
Using the approximate formula for the Doppler shift, 
one finds that a source is moving away at 0.60 c. What result would the exact formula yield for the recession speed?
A. 0.84 c B. 0.72 c C. 0.60 c D. 0.54 c E. 0.40 c