A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be $a$ . If the bird flies about inside the cage, the reading of the spring balance is $b$ . Which of the following is true?

a = b

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a > b

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a

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Cannot be obtained

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Solution

The correct option is B $a > b$
Reading shown on the spring balance is weight of bird + weight of cage. When bird starts flying normal force exerted by bird on the case become zero. When bird flies his weight is carried by air but case in made of wire so no additional force of weight of bird act on the cage so reading on the cage is less when bird is flying.

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A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be a. If the bird flies about inside the cage, the reading of the spring balance is b. Which of the following is true?

A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be $a$ . If the bird flies about inside the cage, the reading of the spring balance is $b$ . Which of the following is true?