CH ENGR 101A Study Guide - Quiz Guide: Hot Air Balloon
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The drag coefficient for a newly designed hybrid car is predicted to be 0. 21. The cross-sectional area of the car is 30 ft2. Determine the aerodynamic drag on the car if it is driven at a speed of 50 mph against a head wind of 5 mph. In a non-windy day a baseball is thrown by a pitcher at a speed of 95 mph. The diameter of the baseball is 2. 82 inches. A hot air balloon, assumed to be spherical in shape, has a volume of 70,000 ft3 and a weight of 500 lb (including the basket, passengers, balloon fabric, etc. ). The outside air temperature is 80of and the temperature within the balloon is 165of. Estimate the rate at which the balloon will rise under steady state conditions if the atmospheric pressure is 14. 7 psi. A blimp that is 128 ft long and has a maximum diameter of 33 ft is used in various athletic events.
