A hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By Newton's third law, the air exerts an upward force of the same magnitude on the bird's wings. Find the average mechanical power (in W) delivered by a 3.20 g hummingbird while hovering if its wings beat 60.0 times per second through a stroke 3.58 cm long.

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Asked Oct 25, 2019
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A hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By Newton's third law, the air exerts an upward force of the same magnitude on the bird's wings. Find the average mechanical power (in W) delivered by a 3.20 g hummingbird while hovering if its wings beat 60.0 times per second through a stroke 3.58 cm long.

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Expert Answer

Step 1

Formula to calculate the average power is

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(II) Δt Pis the average power, W is the work done in each stroke and At is the time required for each stroke

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Step 2

The work done in each stroke is

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W mgd....II mg is the weight of the bird and dis the length of the stroke

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Step 3

Substitute equation (II)...

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Pmgd At

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Work,Power and Energy

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