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22 April, 00:53

A hummingbird is hovering motionless beside a flower. The blur of its wings shows that they are rapidly beating up and down. If the air pushes upward on the bird with a force of 0.25 N, what is the force exerted on the air by the hummingbird? If the force of the bird on the air is downward, enter a negative value and if it is upward, enter a positive value.

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  1. 22 April, 01:40
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    -0.25 N

    Explanation:

    We are given that a humming bird is hovering motionless beside a flower.

    Force applied on bird by air=0.25 N

    We have to find the force exerted on the air by the humming bird.

    We are given that bird is motionless

    Then, force applied on the bird by air = Force applied on the air by bird (Newton's third law)

    Therefore, force applied on the bird=0.25 N.

    It is downward force due to gravity. Hence, the force applied on air by bird=-0.25 N
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