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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A: Given: The altitude of flight, h = 15000 m The speed of flight, v = 85 m/s The drag coefficient, cf…

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Q: A propeller driven aircraft has the following parabolic non-dimensional drag curve: CD = 0.015 +…

A:

Q: The boundary layer formed as turbulent around the sphere is when ReD = 2.5*10^5 (a) Golf…

A: Re= 2.5×105Golf ball diameter, Dg= 43 mm= 0.043 mSoccer ball diameter, Ds= 222 mm= 0.222 m   Note:…

Q: 21. Your plane has a lift to drag ratio ofn = 14.4 at a 10° angle of attack and mass of 3500kg. The…

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Q: 3435 E1 (B) Air at 27°C flows over a flat plate with a velocity of 3 m/s. Calculate the boundary…

A:

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A:

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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.