Which of the following bodies is comprised mostly of plasma?
A) Earth
B) Moon
C) Sun
D) all of the above
E) none of the above
Answer: C
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In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She then allows it to slow down on its own, and counts 240 revolutions before the apparatus uniformly comes to a stop
The moment of inertia of the flywheel is 0.0850 kg ? m2. What is the magnitude of the retarding torque on the flywheel? A) 0.0000136 N ? m B) 0.0787 N ? m C) 0.159 N ? m D) 0.000278 N ? m E) 0.0425 N ? m
A successful theory of the formation of the solar system must explain
A) that all planets rotate in a prograde sense. B) that all planets have elliptical orbits with high eccentricities. C) the existence of the asteroid belt between Jupiter and Neptune. D) that the inner planets have more hydrogen and helium in their atmospheres than do the outer planets. E) all observed properties of the solar system.
Suppose you find a meteorite made almost entirely of metal. According to current science, which of the following statements must be true?
A) Your meteorite is a fragment of an object from the Kuiper belt. B) Your meteorite is a fragment from the core of a large asteroid that shattered in a collision. C) Your meteorite was blasted off the surface of Mars by an impact. D) Radiometric dating will show the age of your meteorite to date to the formation of our solar system.
Luminosity has units of energy per time. Apparent brightness has units of energy per time per area. Which of the following expressions correctly states the relationship between luminosity, distance, and apparent brightness (known as the "inverse square law for light")?
A) luminosity = B) apparent brightness = C) apparent brightness = luminosity × 4? × (distance)2 D) distance =