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A 10 lbm mass undergoes a process during which the velocity decreases from 100 f

ID: 1854513 • Letter: A

Question

A 10 lbm mass undergoes a process during which the velocity decreases from 100 ft/s to 50 ft/s, while the elevation remains unchanged. The initial specific internal energy is 0.5 Btu/lbm and the final specific internal energy is 0.8 Btu/lbm. During the process, the mass receives 2 Btu of energy by heat transfer through its bottom surface and loses 1 Btu of energy by heat transfer through its top surface. The lateral surface is insulated and experiences no heat transfer. For this process, evaluate a) the change in kinetic energy of the mass in Btu, and b) the work in Btu.

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