The area under a graph of ax vs. t from t = ti to t = tf represents
a. xf ? xi.
b. vf ? vi.
c. xav.
d. vav.
e. aav.
b
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A pair of identical balls is connected by a massless rod, and thrown up into the air. The velocity of the center of mass is initially 17.2 m/s upward. 1.0 s later, one of the balls is measured to be at rest. What is the velocity of the other ball at this time? Ignore air resistance.
A. 14.8 m/s up B. 9.8 m/s down C. 7.4 m/s up D. 7.4 m/s down
Suppose you find an X-ray binary system that shows X-ray bursts. Is it possible that this system consists of a red giant and a black hole? Why or why not?
What will be an ideal response?
A brass cube, 15.0 cm on a side, is raised in temperature by 170°C. The coefficient of volume expansion of brass is 57 × 10^?6/C°. By what percentage does volume increase?
a. 33% b. 1.4% c. 1.0% d. 3.4% e. 2.81%
A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x axis?
a. 275 kg•m2 b. 90 kg•m2 c. 176 kg•m2 d. 99 kg•m2