Q: A long 5-cm-diameter steam pipe passes through some
A long 5-cm-diameter steam pipe passes through some area open to the wind. Determine the drag force acting on the pipe per unit of its length when the air is at 1 atm and 10°C and the wind is blowing...
See AnswerQ: Consider 0.8-cm-diameter hail that is falling
Consider 0.8-cm-diameter hail that is falling freely in atmospheric air at 1 atm and 5°C. Determine the terminal velocity of the hail. Take the density of hail to be 910 kg/m3.
See AnswerQ: A 1.2-in-outer-diameter pipe is
A 1.2-in-outer-diameter pipe is to span a river at a 115-ft-wide section while being completely immersed in water. The average flow velocity of the water is 8 ft/s, and its temperature is 70°F. Deter...
See AnswerQ: A 2-m-long, 0.2-m
A 2-m-long, 0.2-m-diameter cylindrical pine log (density = 513 kg/m3) is suspended by a crane in the horizontal position. The log is subjected to normal winds of 40 km/h at 5°C and 88 kPa....
See AnswerQ: What is the difference between the upstream velocity and the free-
What is the difference between the upstream velocity and the free-stream velocity? For what types of flow are these two velocities equal to each other?
See AnswerQ: A 0.12-mm-diameter dust particle whose density
A 0.12-mm-diameter dust particle whose density is 2.1 g/cm3 is observed to be suspended in the air at 1 atm and 20°C at a fixed point. Estimate the updraft velocity of air motion at that location. Ass...
See AnswerQ: A person extends his uncovered arms into the windy air outside at
A person extends his uncovered arms into the windy air outside at 1 atm and 60°F and 25 mi/h in order to feel nature closely. Treating the arm as a 2-ft-long and 4-in-diameter cylinder, det...
See AnswerQ: Dust particles of diameter 0.06 mm and density 1.
Dust particles of diameter 0.06 mm and density 1.6 g/cm3 are unsettled during high winds and rise to a height of 200 m by the time things calm down. Estimate how long it takes for the dust particles...
See AnswerQ: What is stall? What causes an airfoil to stall? Why
What is stall? What causes an airfoil to stall? Why are commercial aircraft not allowed to fly at conditions near stall?
See AnswerQ: Air is flowing past a symmetrical airfoil at zero angle of attack
Air is flowing past a symmetrical airfoil at zero angle of attack. Is the (a) lift and (b) drag acting on the airfoil zero or nonzero?
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