A planetary nebula arises from
A) the remains of a solar atmosphere.
B) planetary accretion.
C) a black hole.
D) the gravitational attraction of interstellar dust.
Answer: A
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How can we mathematically express Newton's law of gravity? (In the following, F is the force of Gravity, G is a constant; m and M are the masses or two bodies (such as Earth and the Sun); and r is the distance between the centers of mass of the two bodies.)
A. F = GMm/r2 B. F = Gm2M/r2 C. F = GMm/r3 D. F = GMm/r
The slope of a velocity vs. time graph is the
a. distance. b. velocity. c. acceleration. d. none of the above
Betelgeuse is a red supergiant star in the constellation Orion. It radiates heat at the rate of 2.70 × 1030 W and has a surface temperature of 3000 K. Assuming that it is a perfect emitter, what is the radius of Betelgeuse?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.16 × 1011 m
You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about
A) 0.08 m/s2. B) 0.8 m/s2. C) 8.0 m/s2. D) none of the above