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Question

A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight placed on a spring balance, It records a weight of 25 N. The bird (mass = 0.5kg) flies upward in the cage with an acceleration of 2m/s2. The spring balance will now record a weight of


A

24 N

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B

25 N

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C

26 N

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D

27 N

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Solution

The correct option is B

25 N


Since the cage is closed and we can treat bird cage and air as a closed (Isolated ) system. In this condition the force applied by the bird on the cage is an internal force due to this reading of spring balance will not change.


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