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An air-conditioning system is used to maintain a house at 75°F when the temperature outside is 95°F. The house is gaining heat through the walls and the windows at a rate of 800 Btu/min, and the heat generation rate within the house from people, lights, and appliances amounts to 100 Btu/min. Determine the minimum power input required for this air-conditioning system.
a 4-in. diameter disk shown weigts 20 lb. the disk is released at rest when theta30 degrees and rolls down the curved
Consider the following investment opportunity: Initial Cost = $126,890; Annual Benefit = $23,000; Useful Life = 30 Years; Salvage Value = $0; What interest rate results in a Benefit Cost Ratio equal to one?
at a given instant train e has a speed of 20ms and an acceleration of 14ms2 acting in the direction shown 75 degrees to
determine the force and moment reactions at the support A of the built in beam which is subjected to the sine-wave load distribution.
1. half a mole of a monoatomic ideal gas is initially at 1000 k and a pressure of 20 bar. it is expanded adiabatically
A tank at an elevation of z1 = 15 m contains 0.005 kg of saturated liquid H2O at T1 = 200 C and is attached to a paddle wheel. Take the reference state to be T0 = 25 ?C and p0 = 101.3 kPa. Compute the exergy transfer due to the process and the amount..
a steam seperator seperates a 6 mpa saturated steam mixture into two streams whose pressure is the same as at the
An adiabatic piston cylinder contains 1 kg of R-134a. Initially the conditions inside the piston are 200 kPa and 0 degrees C. An electric heater inside the device runs with constant voltage of 110 V and a constant 0.1A of current for one hour.
Volunteer Pharmaceuticals (VP) wants to set aside money in the R&D fund to seek supplemental drug applications of its two newly developed drugs. Instead of putting away $780 million now, VP plans to set aside $A each year from year 1 through 40. What..
A 400-mm-diameter impeller of a radial-flow water pump rotates at 120rad/s and has a discharge of 0.5 m3/s. Determine the discharge for a similar pump that has an impeller diameter of 100mm and operates at 90rad/s.
a composite rod consists of two different materials a and b each of length 0.5 l. the thermal conductivity of material
air enters the compressor of a regenerative gas-turbine engine at 300k and 100 kpa where it is compressed to 800 kpa
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