A heat engine in each cycle absorbs energy of magnitude |QH| as heat from a high temperature reservoir, does work of magnitude |W|, and then absorbs energy of magnitude |QL| as heat from a low temperature reservoir. If |W| = |QH| + |QL| this engine violates:
A. the zeroth law of thermodynamics
B. the first law of thermodynamics
C. the second law of thermodynamics
D. the third law of thermodynamics
E. none of the above
Answer: C. the second law of thermodynamics
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The mass of the black hole in the center of the galaxy has been determined by observing the motion of stars orbiting it
a. True b. False Indicate whether the statement is true or false
Thermal Expansion: A quantity of mercury occupies 400.0 cm3 at 0°C. What volume will it occupy when heated to 50°C? Mercury has a volume expansion coefficient of 180 × 10-6 K-1.
A. 450 cm3 B. 409.7 cm3 C. 403.6 cm3 D. 401.8 cm3
According to the chart shown in figure Q13.6, how many stable isotopes of 30Zn exist?
A. One
B. Two
C. Three
D. Five
E. There is no way to determine this from the chart.
A block, moving on a frictionless horizontal surface on Earth, requires a force if it is to be stopped. Now suppose that the same block, moving with the same speed on a frictionless horizontal surface on the Moon, where gravity is less, is to be stopped in the same time. We can say that, compared to the Earth,
A. the block could not be stopped. B. the force required would be the same. C. less force is required to stop the block on the Moon. D. greater force is required to stop the block on the Moon.