Q.

A man inside an artificial satellite feels weightlessness, because the force of attraction due to earth is

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a

zero at that place

b

is balanced by the force of attraction due to moon

c

is balanced by centrifugal force

d

non-effective due to particular design of satellite

answer is C.

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Detailed Solution

An artificial satellite has radially onward acceleration i.e centripetal acceleration (V2 /r).Since the satellite is a non-inertial frame , a pseudo force (mV2 / r) , radially outward centrifugal force must be acting on the man.At the same time the man is pulled towards the centre of earth by gravitational force of attraction.The pseudo force balances the gravitational force of attraction and the man feels weightlessness.
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A man inside an artificial satellite feels weightlessness, because the force of attraction due to earth is