A pot that falls from a ledge and hits the ground 45 m below hits the ground at
A) 30 m/s.
B) 60 m/s.
C) 120 m/s.
D) more than 120 m/s.
Answer: A
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Protostars can be observed in
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
The radial velocity curve of a star with an extrasolar planet is a plot of
A) radial velocity against luminosity B) radial velocity against brightness C) radial velocity against distance D) radial velocity against time
A ballet dancer is spinning in the middle of a horizontal frictionless stage. Which of the following things could he change by moving parts of his body or his whole body? (There could be more than one correct choice.)
A) his total kinetic energy B) the location of his center of mass (or center of gravity) C) his angular momentum D) the horizontal component of his linear momentum E) his rotational kinetic energy F) his translational kinetic energy G) his moment of inertia
An incandescent light (glowing tungsten filament) produces:
A) a continuous spectrum, with the peak giving the temperature of the filament. B) an emission spectrum, with bright lines due to ionized tungsten. C) an absorption spectrum, with dark lines due to the solid filament. D) a continuum, with bright tungsten lines added. E) a continuum, with dark lines of tungsten and argon as well.