Earth Satellites

Newton argued that if a cannon could be placed on a hill high enough to be outside the earth's atmosphere, and if the cannon could be made powerful enough, a cannonball could be placed in orbit around the earth.

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QUESTION OF
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Questions #: 2
Time: 5 minutes
Pass Score: 80.0%
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What keeps such a cannonball from flying into space is the force of gravity

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Correct Answer

Explanation

The cannonball never reaches the ground

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because the curvature of the earth is just enough so that as cannonball falls, it gets no closer to the surface.

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Correct Answer

Explanation

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0
sin cos tan
sin-1 cos-1 tan-1 π e
xy x3 x2 ex 10x
y√x 3√x √x ln log
( ) 1/x % n!
7 8 9 + MS
4 5 6 – M+
1 2 3 × M-
0 . EXP ÷ MR
± RND C = MC
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Year 9