Mars' axial tilt and spin are most similar to ________.
A. Venus's
B. Mercury's
C. the Moon's
D. Earth's
Answer: D
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To determine the structure of the interior of a star, astronomers must balance density, luminosity, and ____
a. mass b. temperature c. mass and temperature d. mass and opacity e. temperature and opacity
The temperature of black holes is estimated to be ________.
A. hotter than a white dwarf B. hotter than 1 million degrees C. less than 1 millionth of a degree D. hotter than the Sun E. Black holes do not have temperature.
Which of these features is attributed to the shrinking of Mercury's core?
A) rilles B) scarps C) craters D) mare E) rays
A perfect Carnot engine operates between 350 K and 600 K. The engine delivers 10 kJ of work in each cycle. How much heat is extracted from the 600 K reservoir in one cycle?
A) 34 kJ B) 27 kJ C) 17 kJ D) 21 kJ E) 24 kJ