A small planet having a radius of 1000 km exerts a gravitational force of 100 N on an object that is 500 km above its surface. If this object is moved 500 km farther from the planet, the gravitational force on it will be closest to
A) 75 N.
B) 71 N.
C) 56 N.
D) 50 N.
E) 25 N.
Answer: C
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After World War II, the U.S. Government spent two decades investigating UFOs because they
A) were themselves developing new types of aircraft and used the official investigation as a cover-up B) thought that they might be new types of aircraft being developed by the Soviet Union C) knew that UFOs were alien craft and used the official investigation as a cover-up D) were afraid that an alien civilization was in the process of invading the Earth
The best places for life to have formed on Earth are believed to have been
a. near the south pole on the ice. b. on the continent of Africa in the areas with no water. c. in liquid water, probably in the oceans or pools of water.
A planet is detected via the Doppler technique. The shape of the periodic velocity pattern tells us
A) the planet's size. B) the planet's mass. C) the planet's density. D) the orbital period of the planet. E) the orbital eccentricity of the planet.
A galaxy with a blueshift is moving ________ Earth
Fill in the blank(s) with correct word