A frictionless piston-cylinder device and a rigid tank contain 3 kmol of an ideal gas at the same temperature, pressure and volume. now heat is transferred, and the temperature of both systems is raised by 10°c. the amount of extra heat that must be supplied to the gas in the cylinder that is maintained at constant pressure is.

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The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

When using the scientist method, which step comes last?