Quasars must be small because they
a. have high radial velocities.
b. are very luminous.
c. are surrounded by quasar fuzz.
d. radiate huge amounts of energy.
e. fluctuate rapidly on time scales as short as a few hours.
E
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Energy and Mass: One of the first atomic explosion released approximately 1.0 × 1014 J of energy. How much matter had to be changed into energy to produce this yield? (c = 3.0 × 108 m/s)
A. 1.1 g B. 23 g C. 13 g D. 0.45 kg E. 1.1 kg
A solid ball and a hollow ball are released from rest at the top of an incline and roll without slipping to the bottom. Which reaches the bottom first?
A. The solid ball. B. The hollow ball. C. Both will arrive at the same time. D. The result depends on the balls’ relative masses. E. The result depends on the balls’ relative radii. F. The result depends on the ball’s relative masses and their relative radii.
Which of the following is not a conserved quantity?
A) energy B) momentum C) angular momentum D) radiation
If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, they will then exert
A) a repulsive electric force on each other, but no magnetic force. B) a repulsive magnetic force on each other, but no electric force. C) an attractive electric force on each other, but no magnetic force. D) an attractive magnetic force on each other, but no electric force. E) no electric or magnetic forces on each other.