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Square panels (250 mm × 250 mm) with a decorative, highly reflective plastic finish are cured in an oven at 125C and cooled in quiescent air at 29°C. Quality considerations dictate that the panels remain horizontal and that the cooling rate be controlled. To increase productivity in the plant, it is proposed to replace the batch cooling method with a conveyor system having a velocity of 0.5 m/s.
Compare the initial (immediately after leaving the oven) convection heat transfer rates for the two methods.
a 9-cm-diameter spherical ball whose surface is maintained at a temperature of 110oc is suspended in the middle of the
An object whose mass is 400 kg is located at an elevation of 25 m above the surface of the earth. For g 5 9.78 m/s2, determine the gravitational potential energy of the object, in kJ, relative to the surface of the earth.
The variable operating cost of the lathe, including labor, is $18.60 per hour. The variable operating cost of the drill, including labor, is $16.90 per hour. Finally, there is a sunk cost of $5,000 for Design A and $9,000 for Design B due to obsol..
determine the volume required to store 25kg of ethane at 320kpa and 35 degrees celsius. if the temperature rises to 65
an inventor claims to have developed a refrigerator that requires a net power input of 0.7 hp to remove 12000 btuh of
Steam enters a converging nozzle at 800 kPa and 280 C with negligible velocity. If the expansion is isentropic, what is the minimum pressure that can be reached in such a nozzle and what is the cross-sectional area at the nozzle throat at this pressu..
a diesel engine has a compression ratio of 20 and a cutoff ratio of 2. air is at 95 kpa and 290 k at the beginning of
two resistors are given r1 470 ohms and r2 1200 ohms a the two resistors are connected in series with a 48 v source.
A heat pump operates at steady state maintains a house at 22 0C when the outside is -22 0C using 15 kW of power. The manufacturer claims that the power input required is 3.2 kW. Applying energy and entropy rate balances evaluate the claim.
Compute the energy loss in a 90° bend in a steel tube used for a fluid power system. The tube has a 11/4-in OD and a wall thickness of 0.083 in. The mean bend radius is 3.25 in. The flow rate of hydraulic oil is 27.5 gal /min.
What types of switching configuration is used to control a lighting installation from two points? What types of switches are used and how are switches arranged in the circuit?
Determine the maximum safe value of P according to the maximum shear stress theory. Use σyp = 200 MPa.
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