: The cylinder shown in Fig. (2), Acyinder=7.012cm?, has two pistons mounted, the upper one, mp1 =100kg, initially resting on the stops. The lower piston (mp2 =0kg) has 2kg water below it, with a spring (linear) in vacuum connecting the two pistons. The spring force is zero when the lower piston stands at the bottom, and when the lower piston hits the stops the volume is 0.3m. The water, initially at 50kPa, V =0.00206m, is then heated to saturated vapor. Determine: (1) the initial temperature (2) the pressure that will lift the upper piston (3) The condition of steam when the lower piston hits the stops (4) the work done by the water (at saturated vapor state). Patm=101.325kPa Piston 1- stops Piston 2 H:0 Fig.2

: The cylinder shown in Fig. (2), Acyinder=7.012cm?, has two pistons mounted, the upper one, mp1 =100kg, initially resting on the stops. The lower piston (mp2 =0kg) has 2kg water below it, with a spring (linear) in vacuum connecting the two pistons. The spring force is zero when the lower piston stands at the bottom, and when the lower piston hits the stops the volume is 0.3m. The water, initially at 50kPa, V =0.00206m, is then heated to saturated vapor. Determine: (1) the initial temperature (2) the pressure that will lift the upper piston (3) The condition of steam when the lower piston hits the stops (4) the work done by the water (at saturated vapor state). Patm=101.325kPa Piston 1- stops Piston 2 H:0 Fig.2

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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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

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: The cylinder shown in Fig. (2), Acytinder=7.012cm², has two pistons mounted, the upper
one, mp1 =100kg, initially resting on the stops. The lower piston (mp2 =0kg) has 2kg water
below it, with a spring (linear) in vacuum connecting the two pistons. The spring force is
zero when the lower piston stands at the bottom, and when the lower piston hits the
stops the volume is 0.3m?. The water, initially at 50kPa, V =0.00206m, is then heated to
saturated vapor. Determine:
(1) the initial temperature (2) the pressure that will lift the upper piston (3) The
condition of steam when the lower piston hits the stops (4) the work done by the water
(at saturated vapor state).
Patm=101.325kPa
Piston 1
stops
Piston 2
H:0
Fig.2

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