The quantity "angular momentum" (in terms of the fundamental quantities of mass, length, and time) is equivalent to:
a. MLT-2.
c. ML2T-3.
b. ML2T-1.
d. ML3T.
B
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When the mass of a simple pendulum is tripled, the time required for one complete vibration
A) increases by a factor of 3. B) does not change. C) decreases to one-third of its original value. D) decreases to 3/4 of its original value. E) increases to 4/3 of its original value.
The Doppler shift of ultrasonic waves can measure the speed of blood in an artery. If the frequency of the stationary source is 95.0 kHz and the reflected sound has a Doppler shift of 210 Hz, what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s.)
a. 1.0 m/s b. 1.7 m/s c. 3.3 m/s d. 3.9 m/s e. 6.5 m/s
Based on current evidence concerning the amount of deuterium in the universe, we can conclude that
A) ordinary (baryonic) matter makes up most of the mass of the universe. B) neutrons greatly outnumber protons in the universe. C) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. D) the density of ordinary (baryonic) matter is between 1 percent and 10 percent of the critical density. E) we live in a critical-density universe.
The Metonic cycle is the
A) 18-year, 11-day period over which the pattern of eclipses repeats. B) period between successive Easters. C) 12-month period of a lunar calendar. D) 19-year period over which the lunar phases occur on about the same dates. E) 29 1/2-day period of the lunar cycle.