Now assume that Equation 6-14 gives the magnitude of the air drag force on a typ

Question

Now assume that Equation 6-14 gives the magnitude of the air drag force on a typical 23 kg stone, which presents to the wind a vertical cross-sectional area of 0.035 m2 and has a drag coefficient C of 0.89. Take the air density to be 1.21 kg/m3. (a) In kilometers per hour, what wind speed V along the ground is needed to maintain the stone's motion once it has started moving? Because winds along the ground are retarded by the ground, the wind speeds reported for storms are often measured at a height of 10 m. Assume wind speeds are 2.4 times those along the ground. (b) For your answer to (a), what wind speed would be reported for the storm? (Story continues with Problem 61.)

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what is the 6.14 euation

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