Which of the following explains the rocky nature of the inner planets?
A. As the Solar nebula was spinning, the light gases were tossed to the outer parts of the disk.
B. Only the rocky material could condense at the higher temperatures of the inner part of the Solar nebula.
C. The Sun's gravity attracted the rocks to the inner part of the Solar System.
D. The lighter elements (hydrogen and helium) were sucked in by the Sun's gravity.
Answer: B
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A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). How long does it take to make one revolution around the Earth?
What will be an ideal response?
This graph shows the number of asteroids with different orbital periods. Notice the gap indicated by the downward-pointing black arrow. What does this graph tell us about this gap?
A) There are few if any asteroids at the indicated orbital period of about 4 years. B) There are more asteroids concentrated at the orbital period indicated by the arrow than at any other orbital period. C) Asteroids with an orbital period of about 4 years are all located very close together; so close that collisions occur frequently. D) There are exactly 495 asteroids with an orbital period of 4 years.
A mass (M1 = 5.0 kg) is connected by a light cord to a mass (M2 = 4.0 kg) which slides on a smooth surface, as shown in the figure. The pulley (radius = 0.20 m) rotates about a frictionless axle. The acceleration of M2 is 3.5 m/s2. What is the rotational inertia of the pulley?
?
?
A. 0.29 kg?m2 B. 0.42 kg?m2 C. 0.20 kg?m2 D. 0.62 kg?m2 E. 0.60 kg?m2
Which change will not change the kinetic energy of the most energetic electrons emitted in the photoelectric effect?
a. changing the brightness of the light b. changing the frequency of the light c. changing the metal the light is hitting d. All of the above will change the electron's kinetic energy.