Weight and g: The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2)

A. 2.8 × 106 m/s2
B. 9.8 m/s2
C. 4.9 m/s2
D. 1.6 m/s2
E. 0.80 m/s2


Answer: D

Physics & Space Science

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According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?

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An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?

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A parallel plate capacitor has plates each of area 100 and with separation 0.25 mm. If this capacitor is charged with 25 pC, what is the average charge density on the positive plate?

a.
b.
c.
d.
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