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There is a process in which ball bearings made of plain carbon steel are rolling from an oven at a uniform temp of 870 degrees Celsius into a water bath where the water is at 37 degrees Celsius to quench them. A rubber conveyer belt then carries them away. For the rubber to work, the balls must be no hotter than 90 degrees Celsius when leaving the water. The convective coefficient is 590 W/m^2-K and the balls are allowed to be up to 1.0 cm in diameter. If the balls stay in the water bath for 27 seconds, calculate the total amount of heat to be removed from the water to maintain its uniform temperature of 37 degrees Celsius if 100,000 balls are to be quenched per hour
a simply supported wooden beam subjected to a uniformly distrubuted load is able to resist the bending stresses but
The 8-lb block slides in a frictionless slot that lies in the vertical plane. The stiffness’s of springs A and B attached to the block are kA =40 lb/ft and kB= 20 lb/ft. When the block is in position 1, spring A is compressed 0.5 ft and spring B is u..
nitrogen gas at 60 kpa and 7degc enters an adiabatic diffuser steadily with a velocity of 275 mls and leaves at 85 kpa
in a diesel cycle the cutoff ratio is two and the compression ratio is eighteen. at state 1 the air is 14.7 psia and
a 600 mm diameter wheel rolls without slipping on a horizontal surface as shown. rod ab is attached to the wheel at a
the suspension of an automobile can be approximately by the simplified spring-dashpot determine and plot the amplitude
Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at -16oC with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70oC. Changes in KE and PE from inlet to exit can be ignored. Determine: (a) the volume..
Find the velocity of the bullet and block just after impact.
A differential nitrogen pressure exists across a 2-mm-thick steel furnace wall. After some time, steady-state diffusion of the nitrogen is established across the wall. Given that the nitrogen concentration on the high-pressure surface of the wall is ..
Design of absorption column and the cooler. Process design of other units should be completed along with pipe sizes.
a planet operation has fixed costs of 2000000 per year and its output capacity is 100000 electrical appliances per
Methane gas is compressed at the rate of 3x104 m3/hr (as measured at 0.1013 MPa and 15C) from 0.69 MPa and 26.7C to 3.45 MPa. The compressor operates adiabatically and has an efficiency of 80%. After compression, the methane is colled at a constant p..
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