Mars' axial tilt and spin are most similar to ________.

A. Venus's
B. Mercury's
C. the Moon's
D. Earth's


Answer: D

Physics & Space Science

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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.

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Which of these features is attributed to the shrinking of Mercury's core?

A) rilles B) scarps C) craters D) mare E) rays

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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

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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

Physics & Space Science