Q.

A parrot is in a wire cage which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage
 

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a

The reading of the balance will be greater when the parrot flies in the cage

b

The reading of the balance will be less when the parrot flies

c

The reading of the balance remains unchanged

d

None of the above

answer is C.

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Detailed Solution

 Because wire case acts as a open system. So reading of the balance less

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A parrot is in a wire cage which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage