A method for identifying a black hole is to
A. look for voids (holes) in the star fields.
B. search for radio waves from the accretion disk.
C. look for its effect on nearby companions.
D. observe them directly through the space-based telescopes.
Answer: C
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Intensity of Sound: You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A. one-half its original value. B. one-fourth its original value. C. one-sixteenth its original value. D. None of these
For a pair of dice, how many microstates are there that result in the macrostate of rolling a 7?
a. 1 b. 5 c. 6 d. 7 e. 36
An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion
a. ?1.6 m/s2 b. +6.4 m/s2 c. +1.6 m/s2 d. ?2.0 m/s2 e. ?6.4 m/s2
As a 3.0-kg bucket is being lowered into a 10-m deep well, starting from the top, the tension in the rope is 19.6 N. The acceleration of the bucket will be:
a. 6.5 m/s2 downward. c. zero. b. 9.8 m/s2 upward. d. 3.3 m/s2 downward.