Please Help Physics!?

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 4.00 g hummingbird while hovering if its wings beat 65.0 times per second through a stroke 3.42 cm long.

Hint: To find the average power per stroke, calculate the work done each stroke and divide by the time per stroke.

1 Answer

  • 10 months ago
    Favourite answer

    Work per stroke:

    W = F d

    = m g d

    Power = Work per stroke / time per stroke

    P = W/t

    = m g d / (1/f)

    = m g d f

    = 0.00400kg * 9.81N/kg * 0.0342m * 65.0/s

    = 87.2 mW

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