When written in scientific notation, 42,300,000,000 is equal to _____
A) 423 × 1011
B) 4.23 × 1010
C) 0.423 × 1013
D) 42.3 × 108
B
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A gas undergoes a process A-B that traces a straight line in the p-V diagram. At A the gas has a pressure of 75 kPa and a volume of 12 L. At B the pressure is 60 kPA and the volume is 20 L. The heat gained in this process is 600 J
The internal energy of the gas at A is 70 J. What is the internal energy of the gas at B? A) 60 J B) 10 J C) 190 J D) 130 J E) 70 J
The density of a neutron star is
a. about the same as that of a white dwarf. b. about the same as that of the sun. c. about the same as an atomic nucleus. d. zero
A child is riding a tricycle. The pedals are attached directly to the front wheel, which has a radius of 13 cm. The rear wheels are smaller, and have a radius of 8.0 cm
If the child is pedaling at 16 rpm, what is the angular speed of the rear wheels? A) 15 rpm B) 26 rpm C) 24 rpm D) 20 rpm E) 50 rpm
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of star 1 is a factor of 100 less than the luminosity of star 2. C) Star 1 is 100 times more distant than star 2. D) Star 1 is 100 times nearer than star 2. E) Star 1 is 10 times more distant than star 2.