The helium-filled balloon shown in Fig. P9.51 is to be used as a wind speed indicator. T...

The helium-filled balloon shown in Fig. P9.51 is to be used as a wind speed indicator. The specific weight of the helium is γ = 0.011 lb/ft³, the weight of the balloon material is 0.20 lb, and the weight of the anchoring cable is negligible. Plot a graph of θ as a funtion of U for 1 ≤ U ≤ 50 mph. Would this be an effective device over the range of U indicated? Explain.