Which of the following statements about the Moon is true?
A) The Moon goes through a cycle of phases because it always has the same side facing Earth.
B) If you see a full Moon from North America, someone in South America would see a new Moon.
C) The Moon's distance from Earth varies during its orbit.
D) The Moon is visible only at night.
E) The side of the Moon facing away from Earth is in perpetual darkness.
C
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Which of the following expresses a principle which was initially stated by Galileo and was later incorporated into Newton's laws of motion?
a. An object's acceleration is inversely proportional to its mass. b. For every action there is an equal but opposite reaction. c. The natural condition for a moving object is to remain in motion. d. The natural condition for a moving object is to come to rest.
What can you infer about the lepton number of the neutrino?
A. This quanton has lepton number = +1. B. This quanton has lepton number = -1. C. This quanton has lepton number = 0. D. One cannot determine this quanton’s lepton number from the processes we have studied.
Camera Exposure: If a camera lens aperture is set to f/4, then
A. the radius of the lens aperture is ¼ the focal length. B. the focal length of the lens is 4 mm. C. the diameter of the lens aperture is ¼ the focal length. D. the radius of the lens aperture is 4 times its focal length. E. the diameter of the lens aperture is 4 times its focal length.
Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________