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A motor delivers 240 W through the drive shaft to a paddle wheel that agitates liquid water in a close insulated tank maintained at 1 bar. The initial temperature of water and wheel is 20 OC. Determine the temperature rise of the contents after 0.8 h if the mass of the water is 6 kg and the mass and specific heat of the paddle wheel are 0.4 kg and 0.96 kJ/kg-K, respectively.
the environment in a certain area is 15 degrees c. plot the maximum efficiency of a nuclear power plant as a function
water gate is hinged at point o. angle between the gate and the ground is given alpha 60 degrees. the gate opens when
the load bearing piston in a certain hydraulic has an area 50 times as large as the input piston. if the larger piston
a refrigerator operates with a coefficient of performance of 4.2 and requires an electrical input of 700 w. if the
the us energy consumption rate for 2011 is available in existing public data bp.comstatisticalreview bp statistical
the position of a crate sliding down a ramp is given by x 0.25t3 y1.5t2 z6-0.75t2.5 all in units of m where t is in
a large tower is to be supported by a series of steel wires.it is estimated that the load on each wire will be 11100N. determine the minimum required wire diameter assuming a factor of safety of 2 and a yield strength of 1030MPa.
consider a steam turbine where steam enters with a pressure of 10 mpa and temperature 500 degc and expands
a chemical plant produces an ammonia-rich waste gas that cannot be released as-is into the environment. one method to
a pistoncylinder contains water with quality 75 at 200 kpa. slow expansion is performed while there is heat transfer
the average atmospheric pressure in denver elevation 1610 m is 83.4 kp a. determine the temperature at which water
Verify that heating the wire may be treated as a lumped-capacity process, find the steady-state temperature of the wire and find how long it takes for the temperature of the wire to reach 100°C.
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