The moon causes a tidal bulge on the Earth, and the lunar pull on the bulge slows the rotation velocity of the Earth. Where does the lost angular momentum go?
What will be an ideal response?
The Earth also exerts a torque on the moon increasing its angular momentum, so total angular momentum is conserved.
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If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct?
a. t = x/v c. v = a/t b. a = v2/x d. t2 = 2x/a
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
a. 500 m b. 250 m c. 120 m d. 1.0 km e. 2.7 km
Many galaxies with erupting black holes are found ____
a. in poor clusters with little intergalactic gas b. isolated in space c. in one of a pair of orbiting galaxies d. very close to the Milky Way galaxy e. in the Local Group
A common 5-liter metal can will float in air if it is
A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough. D) no way, unless the displaced air weighs more than the can and its contents!