A small, dense star the size of Earth that shines by only stored heat is a
A) white dwarf.
B) blue straggler.
C) black dwarf.
D) brown dwarf.
E) blue dwarf.
A
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What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 10^6 m around the Earth? (Mass of Earth = 6.0 × 10^24 kg.)
a. 5.0 × 10^9 J b. 1.0 × 10^10 J c. 1.5 × 10^10 J d. 2.0 × 10^10 J e. 2.5 × 10^9 J
Two masses m1 and m2, with m1 < m2, have momenta with equal magnitudes. How do their kinetic energies compare?
a. KE1 < KE2 b. KE1 = KE2 c. KE1 > KE2 d. More information is needed.
Which color was deviated most by the prism used in the experiment?
What could explain the darker appearance of moons and rings in the outer solar system?
A) They shine by the diminished light at that great distance from the Sun. B) They are made of small, sooty particles and radiation darkening with loss of volatile bright ices. C) They are composed of basaltic eject from the volcanism on Ariel and Triton. D) They are made of water ice that reflects light much more poorly at the very low temperatures of these moons. E) They are composed of mostly rocky material, like S type asteroids.