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A blackened plate is exposed to the sun so that a constant heat flux of 800 W/m^2 is absorbed. The back side of the plate is insulated so that all the absorbed energy is dissipated into the airstrea
Determine the required volume of the cuts and fills for a new road, using the average-end-area-method.
A Carnot heat engine receives heat from a reservoir at 900 degrees Celsius at a rate of 800kJ/min and rejects the waste heat to the ambient air at 27 degrees Celsius.
A motor car shaft consist of a steel tube 30 mm internal diameter and 4 mm thick .thee engine develops 10kW at 2000r.p.m.Find the maximum shear stress in the tube when the power is transmitted thro
Consider a Rankine cycle operating in an ideal reheat mode where the high pressure turbine receives steam at 8MPa and 450 deg. C; the low-pressure turbine is operated at 500kPa ond 500 deg.
If the 160-lb person jumps directly off the back of the boat with a velocity of 7 ft/s, determine the resulting velocity of the boat and remaining person.
A worm gear set has a velocity ratio of 0.05. The worm has two teeth, a lead of 3 in., and a pitch diameter of 1.5in. Determine the helix angle and pitch diameter of the worm gear.
Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 50 meters and wind conversion efficiecy of 14.9 percent. The turbine operates in an area with an average annual wind
The piston diameter is 20.0 cm and the pump's stroke is 22.0cm. The pump is attached to an electric motor that is turning at 1750 RPM.
Draw a free body diagram of the spring cut near the point A and identify the internal forces and moments transmitted across the cut. Hence determine the magnitude and location of the maximum shear str
A well-insulated rigid tank contains 5 kg of a saturated liquid-vapor mixture of water at 150 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed
Calculate the mole fractions (dry basis) and the ppm (parts per million on a wet basis, or moles contained in 106 moles of the wet stack gas) of the stack gas species that might be considered enviro
A 4 lb block with an initial velocity of 5 ft/s is sliding down a 30 degree slope before being slowed by a spring. What is the velocity of the block when the spring has been compressed 1 ft?
A heat pump is used to maintain a house at 22 C by extracting hear from the outside air on a day when the outside air temperature is 2 C. The house is estimated to lose heat at a rate of 110,000 kJ/
Determine (a) the exergetic effectiveness and (b) the exergy destroyed. The surrounds can be taken to be To= 20°C, Po = 100 kPa.
Two meshing helical gears have a 25 degree transverse pressure angle and a 20 degree normal pressure angle. The gears have a diametral pitch of 10 and possess 15 and 45 teeth, respectively. Determin
A 25 degree full-depth spur gear with 45 teeth has an addendum of 1/3 in. What is the minimum number of teeth the pinion may have without interference occuring?
A long slab is heated to 100oC on both sides and then exposed to a focused stream of cold air on the top edge - giving an approximately sinusoidal temperature distribution.
A hydraulic jump at the base of a spillway of a dam is such that the depths upstream and downstream of the jump are .90 and 3.6m, respectively.
Determie a) if the quality of the mixture is initially at 50 percent,claculate the total mass of the mixture and the mass of the vapor and liquid, b) find the final temperature,after heat transfer.
If the air around the thermocouple is at 20oC and the walls are at 100oC, what temperature will the thermocouple read?
A geothermal power plant uses geothermal water extracted at 160oC at a rate of 440 kg/s as the heat source and produces 22 MW of net power. IF enviroment temp if 25oC determince the maximum thermal
You are an engineer in an electric-generation station. You know that flames in the boiler reach a temp of 1200 K and that cooling water at 300 K is available from a nearby river. What is the max ef
Liquid water enters a 25-kw pump at 100-kpa pressure at a rate of 5 kg/s. Determine the highest pressure the liquid water can have at the exit of the pump.
You measured the surface heater temperature to be 120oC. What is the average convective heat transfer coefficient? What do you mean by lumped capacitance?