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
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In his experiment with rolling balls down a ramp at different ramp angles, what did Galileo discover?
a. For any fixed ramp angle, the speed of a ball was always constant, regardless of its weight. b. For any fixed ramp angle, the acceleration of a ball was always constant, regardless of its weight. c. For any fixed ramp angle, the velocity of a ball was always constant, regardless of weight. d. The velocity and acceleration were both constant. e. The heavier balls rolled down the ramp faster.
According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?
A) irregular galaxies B) elliptical galaxies C) spiral galaxies D) We can't say because humans were not alive at that time.
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?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz
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. 
e. 