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An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will |
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a) |
Increase |
b) |
Decrease |
c) |
Not change |
d) |
Be zero |
|
An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will |
|||||||
|
a) |
Increase |
b) |
Decrease |
c) |
Not change |
d) |
Be zero |
|
(c) The system is closed. The weight of parrot is suppresses the base of air cage with a weight equal to weight of parrot. These are internal forces. So there will be no change in the reading of the spring balance |