In a telescopic observation of a field of stars, you see an irregularly-shaped dark patch. This is most likely
A. an area where there are no stars.
B. a dark nebula.
C. a black hole.
D. the dusty center of a globular cluster.
Answer: B
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Which of the following is not a good reason why white-dwarf supernovae are good standard candles for distance measurements?
A) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies. B) All white-dwarf supernovae involve the explosion of stars of nearly the same mass. C) White-dwarf supernovae occur only among young and extremely bright stars. D) White-dwarf supernovae are common enough that we detect several every year. E) All white-dwarf supernovae have similar light curves, which makes them easy to distinguish from massive-star supernovae.
Two people are lifting a 2.0-m wide, 80-kg, office desk by the ends. One side is heavier than the other, and it is found that the person exerting the larger force is exerting a vertical force of 500 N
How far from that person is the center of mass of the desk? A) 0.73 m B) 1.3 m C) 1.4 m D) 0.58 m E) 1.0 m
While driving down the highway a lovebug spatters onto your windshield. Which undergoes the greater impulse?
A) the lovebug B) your car C) both the same
If y = 0.02 sin (30x? 400t) (SI units) and if the mass density of the string on which the wave propagates is 0.005 kg/m, then the transmitted power is
A. 1.03 W. B. 2.13 W. C. 4.84 W. D. 5.54 W. E. 106 W.