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A bird resting on the floor of an airtig...

A bird resting on the floor of an airtight box which is being carried by a boy starts flying. The boy will feel that the box is now

A

heavier

B

lighter

C

same in weight

D

ighter in the beginning and heavier later

Text Solution

Verified by Experts

The correct Answer is:
C
In an air - light box, when the bird is sitting, the weight of the box is the sum of the weight of box and that of bird . When the bird starts flying the bird presses the air down to get upthrust. The reaction is on the bottom of the airtight cage . So, the total weight is equal to sum of the weights of the box and that of bird. Hence , the boy carrying the box will feel the same weight whether the bird is sitting or flying in the airtight cage
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