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Q.

An astronaut floating  weightlessly in space shakes a large iron block rapidly back and forth. She compares that to her moving it on earth on a smooth horizontal surface .She find that:

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a

the shaking costs her no effort because there is no weight of block

b

the shaking costs her some effort but considerably less than on earth.

c

although weightless , the effort required is same

d

the shaking costs her more effort than on earth 

answer is C.

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Detailed Solution

She finds that even though weightlessness the effort required is same.

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