1. A cup anemometer is a device for measuring wind speed. A schematic diagram is shown below (top view): 18 > L 00 L (a) We wish to find the relation between the wind speed V and the rotation rate w. For simplicity, we will only consider two of the cups, with drag coefficients CD, and CD, 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. Find an expression for w. (b) White (Table 7.3) gives CD = 1.4 and CD = 0.4. If the wind speed is 8 m/sec, L is 0.3 m, and A = 0.01 m, what is w in rad/sec? Assume sea-level air for which p= 1.2 kg/m.