__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant
b. A galaxy's color
c. A galaxy's rotation curve
d. A galaxy's diameter
e. The velocity dispersion method
c
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The number of cycles of a wave passing a point per unit time is the wave's
a. speed. b. frequency. c. wavelength. d. amplitude. e. loudness.
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
a. 43 lb b. 34 lb c. 38 lb d. 47 lb e. 24 lb
The symbol indicating the number of neutrons in a nucleus is N
a. True b. False Indicate whether the statement is true or false
Earth is the only planet in the solar system known to have plate tectonics
Indicate whether the statement is true or false