Kepler's second law, which states that as a planet moves around its orbit it sweeps out equal areas in equal times, means that
A) planets have circular orbits.
B) the period of a planet does not depend on its mass.
C) a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun.
D) a planet's period does not depend on the eccentricity of its orbit.
E) planets that are farther from the Sun move at slower average speeds than nearer planets.
C
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The sky is blue because of
a. interference. b. diffraction. c. scattering. d. dispersion. e. polarization.
While on the main sequence a star's primary energy source comes from
a. nuclear fusion. b. nuclear fission. c. gravitational potential energy. d. magnetic fields.
A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
A. Gm1m2/(4r) B. Gm1m2/R C. Gm1m2/(2R) D. Gm1m2/(3R) E. 2Gm1m2/(5R)
X-rays of wavelength 0.080 nm are used in a Bragg scattering experiment with a crystal. If the first order maximum is found at a grazing angle of 
what is the plane spacing in the crystal?
A. 0.31 nm B. 0.71 nm C. 1.4 nm D. 0.38 nm E. 0.77 nm