Question

A bird is sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Will the girl experience any change in the weight of the cage when the bird (i) starts flying in the cage with a constant velocity (ii) flies upwards with acceleration (iii) flies downwards with acceleration?

Answer 1

Very good question. Thanks for asking it.

1] starts flying in the cage with a constant velocity :
constant velocity means acceleration is zero. 
There is no change in weight of the age 

ii)flies upwards with acceleration:
Reaction force is :R=m(g+a)
Thus age will appear heavier than before.

iii)) flies downwards with acceleration:
In this case reaction force:R=m(g-a)
Thus age will appear lighter than before.

Answer 2

Answer:

(i)No

(ii)Yes

(iii)Yes

Explanation:

In a closed glass cage , air inside a bound with the cage .

Therefore,

(i)there would be no change in weight of the cage if the bird flies with a constant velocity.

(ii)the cage becomes heavier, when bird flies upwards with an acceleration.

(iii)the cage appears lighter , when bird flies downwards with an acceleration.

HOPE IT HELPS YOU

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