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An office worker claims that a cup of cold coffee on his table warmed up to 80°C by picking up energy from the surrounding air, which is at 25°C. Is there any truth to his claim? Does this process violate any thermodynamic laws?
air at a velocity of 35. 2 ft sec and a pressure of 793. 1 mm hg flows in a long circular pipe whose inside diameter
a gas is contained in a vertical frictionless piston-cylinder device. the piston has a mass of 4kg and a cross
determine the mass flow rate of fuels in grams per second from the gasoline tank to the cars fuel injection systems and
a 5 18 oz baseball traveling at 80 mph rebounds off of a bat with a speed of 160 mph. the ball is in contact with the
a vertical piston-cylinder device initially contains 0.25 m3 of air at 600 kpa and 300degc. a valve connected to the
air enters a compressor with a pressure of 14.7 lbfin2 a temperature of 70 degrees f and a volumetric flow rate of 40
an electric current of 0.25 a flows through a 5-ohm electrical resistor placed in an evacuated chamber. the resistor is
an aluminum polycrystalline specimen is elastically compressed in plane strain. if the true strain along the
a fire-fighting pumper truck is to deliver water at 1.5 ft3s to a maximum elevation of 60 ft above the hydrant. the
a single cycle of a ramp function of voltage versus time has the form vt 100t from -0.01 to 0.01 s. using direct
a shrink fit assembly is to be performed on a pin and collar. with the starting dia. being 0.875 the pin needs to be
Air enters a gas turbine of an air-standard Brayton cycle at 1000 kPa, 1000 K, and expands to 100 kPa in two stages. The air is reheated between the stages at a constant pressure of 400 kPa to 1000 K. The compressor work input is given as 250 kJ/kg.
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