Q: A circular sign has a diameter of 50 cm and is subjected
A circular sign has a diameter of 50 cm and is subjected to normal winds up to 150 km/h at 10°C and 100 kPa. Determine the drag force acting on the sign. Also determine the bending moment a...
See AnswerQ: Suzy likes to drive with a silly sun ball on her car
Suzy likes to drive with a silly sun ball on her car antenna. The frontal area of the ball is A = 2.08 × 10−3 m2. As gas prices rise, her husband is concerned that she is wasting fuel because of the a...
See AnswerQ: Advertisement signs are commonly carried by taxicabs for additional income, but
Advertisement signs are commonly carried by taxicabs for additional income, but they also increase the fuel cost. Consider a sign that consists of a 0.30-m-high, 0.9-m-wide, and 0.9-m-long rectangular...
See AnswerQ: At highway speeds, about half of the power generated by the
At highway speeds, about half of the power generated by the car’s engine is used to overcome aerodynamic drag, and thus the fuel consumption is nearly proportional to the drag force on a level road. D...
See AnswerQ: A submarine can be treated as an ellipsoid with a diameter of
A submarine can be treated as an ellipsoid with a diameter of 5 m and a length of 25 m. Determine the power required for this submarine to cruise horizontally and steadily at 40 km/h in seawater whose...
See AnswerQ: An adiabatic closed system is accelerated from 0 m/s to
An adiabatic closed system is accelerated from 0 m/s to 30 m/s. Determine the specific energy change of this system, in kJ/kg.
See AnswerQ: A 70-kg bicyclist is riding her 15-kg bicycle
A 70-kg bicyclist is riding her 15-kg bicycle downhill on a road with a slope of 8° without pedaling or braking. The bicyclist has a frontal area of 0.45 m2 and a drag coefficient of 1.1 in the uprigh...
See AnswerQ: Which bicyclist is more likely to go faster: one who keeps
Which bicyclist is more likely to go faster: one who keeps his head and his body in the most upright position or one who leans down and brings his body closer to his knees? Why?
See AnswerQ: A wind turbine with two or four hollow hemispherical cups connected to
A wind turbine with two or four hollow hemispherical cups connected to a pivot is commonly used to measure wind speed. Consider a wind turbine with four 8-cm-diameter cups with a center-to center dist...
See AnswerQ: Reconsider Prob. 15–30. Using appropriate software, investigate
Reconsider Prob. 15–30. Using appropriate software, investigate the effect of wind speed on the torque applied on the pivot. Let the wind speed vary from 0 to 50 m/s in increments of...
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