COSMIC PERSP.FUND.-MASTERING ASTRONOMY
COSMIC PERSP.FUND.-MASTERING ASTRONOMY
3rd Edition
ISBN: 9780134989273
Author: Bennett
Publisher: PEARSON
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Chapter 2, Problem 12QQ

Choose the best answer to each of the following. Explain your reasoning.

Which of the following best describes why the Greeks rejected the correct explanation for apparent retrograde motion? (a) They did not realize that planets sometimes appear to move backward relative to the constellations. (b) They predict that if Earth orbited the Sun, then stellar parallax should occur, but they could not detect this parallax. (c) They never even considered the possibility that Earth could orbit the Sun.

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Choose the best answer to each of the following. Explain your reasoning. Which of the following is not true during Northern Hemisphere summer? (a) Sunlight strikes the ground at a steeper angle in the Northern Hemisphere that it does in the Southern Hemisphere. (b) The Sun follows a longer and higher path through the Northern Hemisphere sky than it does through the Southern Hemisphere sky. (c) Noontime shadows are longer in the Northern Hemisphere that in the Southern Hemisphere.
State the definition for a parsec, and derive its value in terms of As- tronomical Units. Convert your answer for the value of the distance of a parsec in Astronomical Units into light years. Be sure to include a large and clearly labeled diagram showing how you arrived at your conclusions. Be sure to show all work!
Gravitational Potential Energy. Directions: Answer the following problem involving gravitational potential energy. Refer to information given in the box below. The gravitational potential energy of a pair of masses, m, and mz, that are a distance r apart is U, =Cm, m, 2. What is the gravitational potential energy of the moon with respect to the earth? The mass of the moon is 7.35 x 1022 kilograms and the mass of the earth is 5.98 x 1024 kilograms. The earth moon distance is 384, 400 kilometers. Show your solution and answer. Remember that the earth-moon distance is still in kilometers.
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