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Refrigerant 410a is used for a heat pump. The temperature at the evaporator is -20F. The temperature at the exit of the condenser is 110F. The compressor isentropic efficiency is 0.8. Calculate the specific work required by the compressor, in BTU/lb, to two significant figures.
Employing the ideal gas model, determine the change in specific entropy between the indicated states, in Btu/lbmol?ºR. Solve 2 ways: Use the appropriate ideal gas table AND also by using a constant specific heat value.
water exiting the condenser of a power plant at 38ordmc enters a cooling tower with a mass flow rate of 4.5 x 107 kgh.
find the natural frequencies of oscillation of the double-pendulum below where m1=m2=m, and L1=L2=L.
a closed rigid tank well-insulated contains air initially at 1 bar 300 k. the volume is 2 m3. a stirring rod transfers
consider a carnot cycle for water in a piston-cylinder device. the mass of the water is 1.5 kg. during the isothermal
two forces each of magnitude p are applied to the wrench. the diameter of the steel shaft ab is 15mm. determine the
a symmetrical wedge having a total vertex angle of 60 degrees is traveling at mach number of 3 at an altitude of 15 km.
a cylinder of metal that is originally 100mm tall and 50mm in diameter must be open die forged to a height if 50mm. the
two kilograms of steam expands isentropically in a closed adiabatic system from 2 mpa and 350 degree c to a final
steam enters the adiabatic condenser i.e.heat exchange of a steam power plant at 20 kpa 95 percent quality and with a
a 60-kg woman holds a 9-kg package as she stands within an elevator which briefly accelerates upward at a rate of g4.
a projectile enters a resisting medium at x0 with an initial velocity of vo900fts and travels 4 inches before coming to
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