What other force balances the downward pull of gravity on a NASA satellite while it is in orbit around Earth?
A) The velocity.
B) Centrifugal force.
C) The acceleration.
D) A balancing force is not needed because gravity doesn't act on the satellite.
E) There is no balancing force--gravity is the only force on the satellite.
E
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Indicate whether the statement is true or false
A hurricane, in other parts of the world, is also known as
a. a cyclone. b. a willy-willy. c. a typhoon. d. all of the above.
The tallest column of water able to be supported by using atmospheric pressure is
a. about 10 m. b. about 1 m. c. about 100 m. d. about 1 cm.
When did the heavy bombardment end?
A) about 4.5 billion years ago B) between about 4.3 and 4.5 billion years ago C) between about 3.8 and 4.0 billion years ago D) exactly 3.95 billion years ago