A moon is in orbit around its mother planet. Which of the following statements is always true about its kinetic energy (K), and its gravitational potential energy (U)?
A) K is negative, and U is negative.
B) K is negative, and U is positive.
C) K is positive, and U is negative.
D) K is positive, and U is positive.
C
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Compared to a G-type star, an F-type will have a(n) ________ habitable zone
Fill in the blank(s) with correct word
A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the operating gas in the refrigerator in order to remove 250 J of energy from the interior compartment?
A) 60 J B) 120 J C) 250 J D) 480 J E) 1050 J
Free Fall: To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance.
A. 2.3 s B. 2.6 s C. 2.9 s D. 3.2 s E. 3.6 s
Where does most star formation occur in the Milky Way today?
A) in the halo B) in the bulge C) in the spiral arms D) in the Galactic center E) uniformly throughout the Galaxy