Hw 4 - horizontal at an angle as shown. ind an expression...

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MEEG 332 Homework 4 (2011) Due 11 a.m. Tuesday 15 March 1. A cup anemometer is a device for measuring wind speed. A schematic diagram is shown below (top view): V oo L L L L ω c D 1 c D 2 (a) We wish to Fnd the relation between the wind speed V and the rotation rate ω . ±or simplicity, we will only consider two of the cups, with drag coe²cients c D 1 and c D 2 as shown. We will also only consider the orientation shown where the rod connecting the two cups is perpendicular to the wind direction. Neglect friction. The length of each arm is L and the cup face area is A . Assume sea-level air. ±ind an expression for ω . (b) White (Table 7.3) gives c D 1 = 1.4 and c D 2 = 0.4. If the wind speed is 10 m/sec, L is 0.5 m, and A = 0.01 m 2 , what is ω in rad/sec ? 2. (a) A bicyclist is coasting down a straight road that is inclined to the
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Unformatted text preview: horizontal at an angle as shown. ind an expression for the maximum coasting speed (no pedaling, no braking, assume no friction). The total mass (of the cyclist and the bike) is m , the drag coecient is c D and the eective frontal area is A . Assume sea-level air. (b) or an upright bike, White (Table 7.3) gives c D A = 0.51. or m = 80 kg and = 5 degrees, Fnd the maximum coasting speed in m/sec and also in mi/hr. (c) For a racer on a road bike, White gives c D A = 0.30. Repeat the calcula-tion of part (b) for the racer. 3. White (7th Ed.) Problem 7.56. 4. White (7th Ed.) Problem 7.80. 5. White (7th Ed.) Problem 7.88. 6. White (7th Ed.) Problem 7.14....
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This note was uploaded on 05/18/2011 for the course MEEG 332 taught by Professor Staff during the Spring '08 term at University of Delaware.

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Hw 4 - horizontal at an angle as shown. ind an expression...

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