Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel. During the process, 30 kJ of heat is transferred to the water, and 5 kJ of heat is lost to the surrounding air. The paddlewheel work amounts to 500 N. m. Determine the final energy of the system if its initial energy is 10 kJ. When is energy crossing the boundaries of a closed system heat and when is it work? Answer: 35.5kJ

Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel. During the process, 30 kJ of heat is transferred to the water, and 5 kJ of heat is lost to the surrounding air. The paddlewheel work amounts to 500 N. m. Determine the final energy of the system if its initial energy is 10 kJ. When is energy crossing the boundaries of a closed system heat and when is it work? Answer: 35.5kJ

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Water is being heated in a closed pan
on top of a range while being stirred
by a paddle wheel. During the
process, 30 kJ of heat is transferred to
the water, and 5 kJ of heat is lost to
the surrounding air. The paddlewheel
work amounts to 500 N. m.
Determine the final energy of the
system if its initial energy is 10 kJ.
When is energy crossing the
boundaries of a closed system heat
and when is it work? Answer: 35.5kJ

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