A closed system weighs 7 lbf and undergoes a process in which there is a heat tr

Question

A closed system weighs 7 lbf and undergoes a process in which there is a heat transfer of 35 Btu from the system to the surroundings. The elevation of the system increases by 1000 ft during the process. The specific internal energy of the system increases by 8 Btu/lbm, and there is no change in kinetic energy of the system. The acceleration of gravity is constant at 30 f/s2 . Determine the work, in ft-lbf.

The correct answer is : -80, 960 ft*lb f

Please show me how to do this. If you end up with a different answer, it is probably incorrect.

Explanation / Answer

the work   =   potential energy of system - Heat lost to surrounding

                = (1000 * 1) - (8 * 5)

                = 960   ft*lbf

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.