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A piston-cylinder filled with air receives 10 kJ of heat and expands, doing 5 kJ of work. What is the change in internal energy of the air?
a balanced wheel supported on springs is rotating at 1200 rpm. if a bolt weighing 15 g and located 5 cm from center
a metal matrix composite mmc is made of a 2024 al alloy matrix and continuous nbspboron fibers. the boron fibers are
a heat engine operates between two reservoirs at 850c and 20c. one -half of the work output of the heat engine is used
a coil spring is stretched by two equal and opposite forces f120n. the wire diameter is 5 mm and the mean coil diameter
an instrument to measure the acc. of gravity on mars is made of a spring from which hangs a mass of 0.24 kg. at a place
chilled water enters a thin-shelled 4-cm-diameter 200-mlong pipe at 7degreec at a rate of 0.98 kgs and leaves at
a car engine with a thermal eff. of 33 drives the air-conditioner unit besides powering the car and other auxiliary
a refrigerator with a coefficient of performance of 4 transfers heat from a cold region at -20c to a hot region at 30c.
a thin-walled closed-end cylindrical pressure vessel with spherical end caps is internally pressurized to 500 psi. if
how is diffusion time related to diffusion temperature for the case where the concentration at some distance into an
a ball is dropped from a boat so that it strikes the surface of a lake with a speed of 16.5fts. while in the water the
An inventor wants to increase the efficiency of wood burning stoves by reducing the energy lost through the exhaust stack. He proposes to accomplish this by attaching fins to the outer surface of the chimney, as shown schematically below.
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