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Natural gas (ρ = 0.0044 slugs/ft3 and v = 5.2 × 10-5 ft2 /s) is pumped through a horizontal 6-in.-diameter cast-iron pipe at a rate of 800 lb/hr. If the pressure at section
(1) is 50 psi (abs), determine the pressure at section
(2) 8 mi downstream if the flow is assumed incompressible. Is the incompressible assumption reasonable? Explain.
Two rectangular beams are made of steel having a tensile yield strength of 80 ksi and an assumed idealized stress-strain curve. Beam A has a uniform 1 x 0.5-in. section.
steam at 7 bars and temperature t enters an adiabatic mixing tank. compressed water at 40 c and 7 bars enters at
The owners of a house on a private lake are thinking of using "pumped storage" as a means of reducing their electricity bills. They will pump water from the lake up to a large reservoir overnight, and then during times of peak power prices, release t..
the engine of an automobile supplies 180 hp at 2500 rpm to the drive shaft. if the maximum shearing stress in the drive
the 580-ton tug is towing the 1200-ton coal barge at a steady speed of 6 knots. for a short period of time the stern
Determine the overall heat transfer coefficient, the cooling water outlet temperature, and the steam condensation rate. With all other conditions remaining the same, but accounting for changes in the overall coefficient, plot the cooling water outl..
The gravity load is 400 N/m and includes the weight of the girt. The wind load is 600 N/m. Find the maximum tensile and compressive stresses.
a rigid tank contains a two-phase mixture consisting of 0.2 lb of liquid water and 0.1 lb of water vapor initially at a
each of the two systems is released from rest. calculate the velocity v of each 25 kg cylinder after the 20 kg cylinder
Gravitational forces pull the two stars together. What is the speed of each star at the moment of impact?
In an attempt to reduce the impedance and increase efficiency, the antenna is made of a copper tube, 12-mm in diameter. What is the efficiency of the antenna? Assume current flows entirely within one skin depth, on the surface of the tube.
An airplane tows a 2-m-tall advertising banner at a speed of 160 km/h. If the banner is flat and 5 m long, then estimate its drag assuming fully turbulent flow (μ = 1.8 × 10-5 N s/m2, ρ = 1.2 kg/m3).
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