Janie likes to drive with a tennis ball on her car antenna. The ball diameter is D = 2.62 in and its equivalent roughness factor is «/D 5 1.5 * 1023. Her friends tell her she is wasting gas because of the additional drag on the ball. Estimate how much money (in dollars) she wastes per year by driving around with this tennis ball on her antenna. Use the following additional information: She drives mostly on the highway, about 16,000 miles per year at an average speed of 55 mph. The overall car efficiency is 0.308, rfuel = 50.2 lbm/ft3, and the heating value of the fuel is 1.47 * 107 ft·lbf/lbm. The fuel costs $4.00 per gallon. Use standard air properties. Be careful with unit conversions. Should Janie remove the tennis ball?

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