The strongest piece of evidence that supports the Big Bang is the
A) fact that the universe is expanding
B) detection of dark matter in galaxies
C) fact that stars have finite lifetimes
D) detection of the cosmic microwave background radiation left over from the formation of the universe
D
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A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on the positive charge is:
A) 9.0 × 108 N toward the negative charge B) 9.0 × 108 N away from the negative charge C) 9.0 × 109 N toward the negative charge D) 9.0 × 109 N away from the negative charge E) none of these
Two point sources emit sound waves of 1.0-m wavelength. The sources, 2.0 m apart, as shown below, emit waves which are in phase with each other at the instant of emission. Where, along the line between the sources, are the waves out of phase with each other by ? radians?
A. x = 0, 1.0 m, 2.0 m B. x = 0.50 m, 1.5 m C. x = 0.50 m, 1.0 m, 1.5 m D. x = 0.75 m, 1.25 m E. x = 0.25 m, 0.75 m, 1.25 m, 1.75 m
The energy of motion is called
a. inertia. b. power. c. kinetic energy. d. potential energy.
Which space mission orbited Jupiter and dropped a probe into Jupiter's atmosphere?
a. Pioneer b. Voyager c. Galileo d. Cassini e. New Horizons