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Grade: 12th pass
        
A bird is resting on the floor of an air tight box suspended from a spring balance .If the bird starts flying how will the reading of spring balance change????
2 years ago

Answers : (1)

Arun
23013 Points
							
Dear Student
 
 bird in a wire cage that hangs from a spring balance.Is the reading of the balance when the birds is flying greater than, less than , or the same as that when the bird sits in the cage,,,??? 

For the bird to stay in the air, the wings must push down on the air under them. If the cage is air tight, the air exerts an equal force on the floor of the cage. The net force down on the scale will remain constant. 

IF the cage is not air tight, the air will move down and horizontal. The force down will be less than the weight of the bird
2 years ago
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