
Concept explainers
(a)
The maximum wind speed that a blowfly can stand.
(a)

Answer to Problem 91P
The blowfly can stand a wind speed up to
Explanation of Solution
The cross-sectional area of the blowfly is
For the blowfly to stand the wind, the net torque on it will be zero. Consider the axis of the rotation to pass through the tip of the left leg.
The figure below shows the blowfly and different forces.
Write the formula for the condition to stand the wind.
Here,
Write the formula for the force due to wind.
Here,
Substitute equation (II) in equation (I).
Re-write the above equation to get an expression for
Conclusion:
Substitute
The blowfly can stand a wind speed up to
(b)
The maximum wind speed that a blowfly can stand when the angle is
(b)

Answer to Problem 91P
The blowfly can stand a wind speed up to
Explanation of Solution
The cross-sectional area of the blowfly is
For the blowfly to stand the wind, the net torque on it will be zero. Consider the axis of the rotation to pass through the tip of the left leg.
Write the formula for the condition to stand the wind.
Here,
Write the formula for the force due to wind.
Here,
Substitute equation (II) in equation (I).
Re-write the above equation to get an expression for
Conclusion:
Substitute
The blowfly can stand a wind speed up to
(c)
The maximum wind speed that a blowfly can stand when the angle is
(c)

Answer to Problem 91P
The blowfly can stand a wind speed up to
Explanation of Solution
The cross-sectional area of the blowfly is
For the blowfly to stand the wind, the net torque on it will be zero. Consider the axis of the rotation to pass through the tip of the left leg.
Write the formula for the condition to stand the wind.
Here,
Write the formula for the force due to wind.
Here,
Substitute equation (II) in equation (I).
Re-write the above equation to get an expression for
Conclusion:
Substitute
The blowfly can stand a wind speed up to
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Chapter 8 Solutions
Physics
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