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Question: ahmad likes to drive with a tennis ball on his...

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Ahmad likes to drive with a tennis ball on his car antenna. The ball diameter is D- 6.65 cm and its drag coefficient is Cs 0.505. His friends tell him he is wasting fuel because of the additional drag on the ball. Estimate how much money (in RM) he wastes per year by driving around with this tennis ball on his car antenna. Use the following additional information: He drives mostly on the highway, about 25000 km per year at an average speed of 90 km/h. The overall car efficiency is 0.308, fuel density is Pfuel 0.804 kg/liter, and the heating value of the fuel is 43900 kJ/kg. The fuel costs RM1.06 per liter. The air density is pair 1.184 kg/m3. (12 marks) An airplane has a total mass of 18000 kg and a wing planform area of 35 m2. The density of air at the ground is 1.2 kg/m3. The maximum lift coefficient is 3.48. Determine the minimum safe speed for takeoff and landing. (b) (c) (7 marks)

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