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A metal plate (k = 180 w/(m*k), p = 2800 kg/m^3, cp = 880 J/(kg*k)) with a thickness of 1 cm is being cooled by air at 5 degrees C with a convection heat transfer coefficient of 30 w/(m*k). If the initial temperature of the plate is 300 degrees C, determine the plate temperature after 2 minutes of cooling.
a straight roller bearing is subjected to a radial load of 12 kn. the life is to be 4000 h at a speed of 750 revmin.
a bowling ball has the mass m the radius r and the radius of gyration kg. the ball is rolling on a straight lane with
A centrifugal water pump operates at 1750 rpm and delivers 150 gpm of flow at a head of 125 ft. What would be the flow rate and head for a geometrically similar pump having twice the speed and half the diameter?
1. r-134 enters the condenser of a window air conditioning unit at 800 kpa and 35 c and leaves as a saturated
a 2000kg weight is at the top of a 20m tower. the weight falls by pulley system and transfers all of its energy to a
gusset plate Determine the resultant of the three forces tha must be carried by the gusset plate. 30 degrees off of the wall and F1, F1 = 10k, F2 = 12k, F3 = 18k
Air in piston/cylinder at 200 kPa, 600K is expanded in a constant-pressure process to twice the initial volume (state 2). At this point, the piston is locked with a pin and heat is transferred to a final temperature of 600K. Find the work and heat..
a vertical piston-cylinder device initially contains 0.25 m3 of air at 600 kpa andnbsp300degc. a valve connected to the
a battle has erupted over a local power plant owners decision to raise the power delivered by the plant from 186 mw to
an insulation system is to be selected for a furnace wall at l000degc using first a layer of mineral wool blocks
a closed rigid pressure vessel is filled with a saturated mixture of 1.78 kg of liquid water and 0.22 kg of water vapor
A structural steel bar with a 25 mm x60 mm rectangular cross section is subjected to an axial load of 160 kN. Determine the maximum normal and shear stresses in the bar.
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