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Consider a well sealed, well insulated room with a common household refrigerator/freezer unit. (a) What type of energy crosses the room boundary? (b) If the refrigerator/freezer operates at 120 V, 4 Amp for four hours a day, how much energy (kW-h) is consumed each day? (c) If electricity cost $0.12/kW-h, how much does it cost to operate the refrigerator in a year?
a dump truck is shown in the figure. the loaded container has a mass of 8000 kg and may be modelled as a solid
the truck is to be towed using two ropes. if the resultant force is to be 950 directed along the positive axis
steam is compressed by a compressor from 120oc and 150 kpa to 200oc and 1.5 mpa. the work input is measured to be 485.4
3600 lbmhr of air flows through an ideal converging-diverging nozzle. the air enters at a pressure fo 160 psia and a
suppose the rate of growth of a bacterial population n cellsliter is described by dndt kn -1000. the terms represent
consider a single crystal cylindrical specimen of iron oriented such that a tensile load is applied along a 010
a gas turbine assume ideal brayton cycle has a pressure ratio of 10. it is connected to an electric generator with an
If it is known that the value of the stress exponent n for this alloy is 8.2, compute the steady-state creep rate at 1300 K and a stress level of 89 MPa.
at t0 a disk with mass 3kg is placed on a spinning platform. the disk slides and begins to accelerate. if the maximum
a gas-turbine power plant operates on the simple brayton cycle between the pressure limits of 100 and 800 kpa. air
steam at 2 kg s enters a turbine at 6000 kpa and 600 c and exits as saturated vapor at 20 kpa. the turbine produces
determine (a) the instantaneous center of rotation of the double pulley (b) the velocity of th slider block (c) the number of inches of cord wrapped or unwrapped on each pulley per second.
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