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Two refrigerators are arranged in series. One of them receives 300 kJ/cycle from a reservoir at 300 K. The heat rejection from this refrigerator serves as the heat input to the second refrigerator which delivers 1000 kJ/cycle of heat output to a reservoir at 1000 K. The two refrigerators have the same coefficients of performance. (a) Determine the heat exchange between the first to the second cycle (kJ/cycle) that occurs at the intermediate temperature. (b) What is the coefficient of performance of each refrigerator? (c) Compute the work required (kJ/cycle) to operate each refrigerator.
a robot arm moves so that p travels in a circle about point b which is not moving. knowing that p starts from rest and
small blocks each with mass m are clamped at the ends and at the center of a rod of length l and negligible mass.a
a refrigerator uses a compressor that employs r-134a as the refrigerant. determine the power requirement w and
Draw the shear force diagram for the beam and determine the position and magnitude of the maximum bending moment.
determine the force and moment reactions at the support A of the built in beam which is subjected to the sine-wave load distribution.
a 100-pound sign is supported at the midpoint of a cable stretched between anchor points that are separated by 86 feet.
a quantity of steam the original pressure and volume being 140 knm2 and 150 litres respectively is compressed to a
determine the steady state rate of heat transfer per unit area through a 4.0 cm thick homogeneous slab with its two
consider air parcel moving upwards. a what will be the air parcels temperature be at 2 km altitude if the surface
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The spool has a mass of 75 kg and a radius of gyration . It rests on the inclined surface for which the coefficient of kinetic friction is . If the spool is released from rest and slips at A, determine the initial tension in the cord and the angul..
the slotted link is pinned at o and as a result of the constant angular velocity theta dot 3rads it drives the peg p
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