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The longitudinal joint in an 8-ft-diameter closed cylindrical steel boiler is butt welded with a joint efficiency of 85%.
The boiler plate is 3 4 in. thick with an allowable tensile stress of 11,000 psi. Calculate the maximum safe internal pressure.
Assuming laminar flow, find the boundary-layer thickness δ, displacement thickness δ∗, and momentum thickness θ at the end of the plate. Also calculate the drag force on one side of the plate (μ = 10-3 N s/m2, ρ = 1000 kg/m3).
A group of 20 students attend class in a room which measures 7m x 7m and has a 3 m ceiling height. Assume that each student occupies 0.07 m3 and gives out 400 kJ of heat per hour. Calculate the air temperature rise occurring within 15 min of the star..
H2O enters a well-insulated nozzle at 200 psia, 500 degrees F, with a velocity of 200 ft/s and exits at 60 psia, with a velocity of 1700 ft/s. for steady state operation determine the exit temperature
the angle between the direction of motion of a conductor and the lines of flux is 30deg. the length of the conductor in
a well-insulated tank contains 1 mole of air at 2 mpa and 673 k. it is connected via a closed valve to an insulated
A woman with mass 50 kg is standing on the rim of a large disk that is rotating at 0.50 rev/s about an axis through its center. The disk has mass 110kg and radius 4.0 m. Calculate the magnitude of the total angular momentum of the women-plus-disk ..
Determine an equation for the efficiency of the gear train in terms of the load (torque) on shaft 2 and determine the input power required at shaft 1.
a 30-cm-diameter 5-m-long steam pipe passes through a room where the air temperature is 20 c. if the exposed surface of
a large stationary diesel engine produces 15 mw with a thermal efficiency of 40. the exhaust gas which we assume is air
superheated steam enters a nozzleat 0.13 mpaand 600 k and exits at 0.1 mpa. heat interactions and frictional effects
steam flows steadily into a turbine with a mass flow rate of 26 kgs and a negligible velocity at 6 mpa and 600 c. the
in a mild steel block a flat surface of length 100 mm and width 60 mm has to be finished in a shaping machine in a
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