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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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
If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years, what would we see happen?
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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
What is the molecular formula for benzene?
a. C6H6 b. C6H12 c. C6H14 d. C6H8 e. None of these