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Question

Consider the two orbits around the sun shown below. Orbit P is circular with radius R, orbit Q is elliptical such that the farthest point b is between 2R and 3R, and the nearest point a is between R/3 and R/2 . Consider the magnitudes of the velocity of the circular orbit vc , the velocity of the comet in the elliptical orbit at the farthest point vb , and the velocity of the comet in the elliptical orbit at the nearest point va . Which of the following ranking is correct?
1451374_cb06edd6b6f4417780841c460a08891a.png

A
vb>vc>2va
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B
2vc>vb>va
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C
10vb>va>vc
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D
vc>va>4vb
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Solution

The correct option is A vb>vc>2va
According to the Kepler's law,
the thing will be added a formula is called T2×R3
and velocity α1time
The 2R,3R and R/3 and R/2.
hence vb>vc>2va

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