Question

An earth satellite of mass m circles the earth with speed u. By how much does its momentum change as it goes halfway around the earth ? Ignore the earths rotation.

Answer 1

The momentum of satellite changes by 2p.

Explanation:

• The speed of satellite remains constant at each point of its circular path.
• However the velocity of satellite changes whenever direction change.

Let initially angular momentum of satellite p = r x Mv

• Now the change in momentum can be calculated as:

Change in momentum of satellite = 2 ( r x Mv) = 2p

Hence the momentum of earth changes by 2p.

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