Why do almost all moons exhibit synchronous rotation in which they rotate with the same period as they orbit their planet?
A) The moons formed this way, with the same rotational and orbital periods.
B) Most jovian moons were formed out of their planet's nebula with the same orbital period.
C) The moons probably once orbited farther away and more slowly, but friction with solar nebula gas caused their orbits to come closer to their planet, speeding them up.
D) The moons probably once rotated faster, but tidal friction slowed their rotations to match their orbital periods.
E) Synchronous rotation is caused by orbital resonances with other moons.
D) The moons probably once rotated faster, but tidal friction slowed their rotations to match their orbital periods.
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A portion or all of the same zodiac constellations can be seen by those in either hemisphere year round
a. True b. False Indicate whether the statement is true or false
Huygen's principle states that
1.there is a secondary rainbow with the spectral colors reversed from the primary rainbow. 2.light has properties of both waves and particles. 3.all points on a wave front can be taken as point sources of secondary spherical wavelets which construct the new position of the wave front as time passes. 4.rainbows are a result of dispersion.
When an elevator is accelerating upward, the frequency of a pendulum inside
A) increases. B) decreases. C) doesn't change.
A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a motion picture was run backwards through the projector. d. any of the above occurred. e. (a) or (b) occurred, but not (c).