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It is desired to produce refrigeration at -25F. A heat source is available at 500F and the ambient temperature is 80F. A heat engine can produce produce work operating between the 500-F source and the ambient surroundings. This work in turn can be used to drive the refrigerator. Assuming all processes are reversible, determine the ratio of the heat transfer from the source to the heat transfer from the refrigerated space.
an electric motor of total weight 3330 pounds is mounted on a simply supported beam with an overhang as shown
the 10-kg mass a is moving at 5 ms when it is 1 m from the stsaionary 10 kg mass b. the coefficiient of kinetic
during drilling of a deep oil well the drill pipe got rigidly stuck. it was necessary to determine the depth at which
at a given location the airspeed is 20 ms and the pressure gradient along the streamline is 100nm3. estimate the air
a rigid well insulated container contains 10 kg of water. a motor connected to a paddle wheel is used to stir the water
an insulated rigid tank is divided into two compartments by a partition. one compartment contains 2.5 kmol ol carbon
During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the work input during this process. R(air)=287j/KgK
An unsuited free diver can work in a pressure of up to 490KN/m^2 and a suited diver in pressure of up to 1815 KN/m^2. Calculate the maximum depths at which they might work in sea-water which has a specific gravity of 1.03.
For the process where q= 62.5 kj/kg and wkcs= 60 kj/kg determine the energy change if the system mass is 2 kg.
a closed rigid tank whose volume is 1.5m3 contains refrigerant 134a initially a two-phase liquid-vapor mixture at 10
a stone is thrown vertically upward from a point on a bridge located 40m above the water. knowing that it strikes the
a c-130 pilot desires to fly a low-level navigation mission at 4 n milesmin 240 kn ground speed. winds are forecast out
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