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Stainless steel ball bearings (density=8085 kg/m^3 and Cp=0.480 kj/kg* C) having a diameter of 1. cm are to be quenched in water at a rate of 800 per min. The balls leave the oven at a uniform temp of 900C and are exposed to air at 25C for a while before they are dropped in the water. If the temp of the balls drop to 850C prior to quenching, determine the rate of hear transfer from the balls to the air.
a flywheel can be considered as being composed of a thin disc and a rim. the rim weighs 322 lb and has diameters of 24
a heat exchanger is to be designed to condense 1100 kghr of steam ay 150 kpa. for this purpose cooling water at 50
a pump is used to supply water from a well to a municipal water system. at the well the water is 10oc at 0 kpa gage.
a piston cylinder device initially contains 0.5 kg of r134a at 200 kpa and a specfic volume of 0.07 m3kg. at this point
Calculate the static thrusts of the rocket and turbojet engine described in the figure. The thrust T is the force necessary to prevent horizontal movement of the engine. Both engines exhaust a mass flow of 40 kg/s.
If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency and the mean effective pressure.
ten kilograms of water at saturated liquid phase fills in a piston-cylinder device volume can change at 50oc. the
determine: (a) the cutting time to complete the facing operation, (b) the cutting speeds and metal removal rates at the beginning and end of the cut.
the y-component of the force f which a person exerts on the handle of the box wrench is known to be 320newton. determine the x-component and the magnitude of force.
A successive approximation ADC has 4 bits and a reference voltage of 10 V. If the input voltage is 2.8 V, describe each step the ADC undergoes to determine the value of the 4 bits. What input voltage will be computed by the ADC?
Calculating a Constant Pressure Process, In a constant pressure, nonflow process, 6Btus of heat are added to a gas while the volumes change from 1.6ft^3 to 2.0ft^3
moist air at 30 degrees c 2 bar and 50 relative humidity enters a heat exchanger operating at steady state with a mass
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