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Q.

A research satellite of mass 200 kg circles the earth in an orbit radius 3RE2, where RE is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth's surface to be 10 N, the pull on the satellite will be :

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a

890 N

b

889 N

c

885 N

d

892 N

answer is B.

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Detailed Solution

F=GME×1RE2             .....(1)Force between earth and mass 1 kg.Force between earth and satellite isF′=GME×20032RE2F′F=8w9⇒F′=8w9F=8W9×10N=889N
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A research satellite of mass 200 kg circles the earth in an orbit radius 3RE2, where RE is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth's surface to be 10 N, the pull on the satellite will be :