How did the natural satellites in the Solar System form?
A. The moons formed by the accretion of debris from massive collisions.
B. The moons probably formed from planetesimals orbiting the growing planets.
C. The moons likely were "captured" as they wandered too close to the planets.
D. All of these choices are correct.
Answer: D
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The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward b. 1.2 m/s2 upward c. 1.2 m/s2 downward d. 10 m/s2 upward e. 2.4 m/s2 downward
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin tropospheres only, with gas coming from evaporation and sublimation. B) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. C) They have only small amounts of gas, all of which is leftover from outgassing long ago. D) They have very thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.
The length of a telescope is 2.20 m and the focal length of the eyepiece is 1.9 cm. What is the focal length of the objective?
A) 41 cm B) 45 cm C) 111 cm D) 218 cm E) 16 cm
What is the frequency of monochromatic light where the photon energy is 4.3 × 10^?19 J? (h = 6.63 × 10^?34 J?s)
a. 4.3E+15 Hz b. 2.1E+15 Hz c. 6.5E+14 Hz d. 1.9E+14 Hz e. 6.5E+13 Hz