Questions

An earth satellite is moved from one stable circular orbit to a farther stable circular orbit. Which one of the following quantities increases

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a

gravitational force

b

gravitational PE

c

linear orbital speed

d

centripetal acceleration

detailed solution

Correct option is B

Gravitational P.E =so If r increases, GMm / r decreases and ' - GMm/r' increases. Hence, option - (2) is right.

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The masses, each of mass m are kept on the vertices of an equilateral triangle of side a. Find the work needed to be done to change the length of the triangle twice of its original value.

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