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A comet orbits the sun in a highly ellip...

A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.

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All quantities vary over an orbit except angular momentum and total energy.
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  15. Assuming the earth to be a sphere of uniform mass density, how much wo...

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