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Select a correct statement of the first law of thermodynamics, and briefly explain why:
A. Heat transfer equals the work done for a process.
B. Net heat transfer equals the net work for a cycle
C. Net heat transfer equals net work plus internal energy change for a cycle.
D. Heat transfer minus work equals change in enthalpy.
a mass of 5 kg of saturated water vapor at 300 kpa is heated at constant pressure until the temperature reaches 200 0c.
Evaluate the shearing and normal stresses at points H and J located at the ends of the horizontal and vertical diameters of transverse section located 2.5 in. to the left of bearing B.
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One side of a right triangle is known to be 45 cm long and the opposite angle is measured as 30?, with a possible error of 1?.
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