Question

Atmospheric pressure is 100 kPa in a system of cylinders and pistons.The mass of the piston is 4 kg and the area of the piston is 4.0 cm2. The following process takes place by external heat transfer. (Gravity acceleration is 10 m / s2).

1. Calculate the pressure inside the cylinder in kPa.

2. The cylinder contains 0.1 kg of water vapor, and the temperature of the water vapor is 150oC. Find the volume and internal energy of water vapor in the initial state.

3. When the energy is applied by heat transfer and the piston moves freely to a final volume of 0.29376 m3, find the work done externally by the piston in kJ.

4. Find the final temperature.

5. During the process, find the heat transfer in kJ.

Answer #1

Solution in the uploaded images

A mass of one kg of water within a piston–cylinder assembly
undergoes a constant-pressure process from saturated vapor at 500
kPa to a temperature of 260°C. Kinetic and potential energy effects
are negligible. For the water:
a) Evaluate the work, in kJ,
b) If the work is 30 kJ, evaluate the heat transfer, in kJ,
c) If the heat transfer is negligible, evaluate the entropy
production in kJ/K
d) Determine if the process is reversible, irreversible, or
impossible.

Water, initially (state 1) a saturated liquid at
1100C, is contained in a piston-cylinder assembly. The
water undergoes a process to the corresponding saturated vapor
(state 2), during which the piston moves freely in the cylinder. If
the change of state is brought about by heating the water as it
undergoes an internally reversible process at constant pressure and
temperature, determine (a) heat transfer using first law of
thermodynamics in kJ/kg and (b) heat transfer using second law of
thermodynamics...

Oxygen gas is contained in a piston cylinder assembly at an
initial pressure of 1000 kPa and expands from 0.2 m3 to 1.0 m3 by a
process where PV = constant. The gas has an internal energy change
of -200 kJ. Calculate the work (kJ) and the heat transfer (kJ) done
during the process.

A 0.2 m3 piston-cylinder initially contains 400 K air. A heavy
frictionless piston maintains a pressure of 500 kPa abs. Then, a
weakness in the cylinder wall blows out and creates a hole. Air
escapes through the hole until the piston drops far enough to cover
the hole. At that point, the volume is half the initial volume.
During this process, 75 kJ of heat is transferred to the 100 kPa,
300 K surroundings. Using Cp = 1.005 kJ/kg-K and...

Think of the piston-cylinder system. Initially, it is filled
with pressure of 8 atmosphere, water of 0.1 m3 and steam of 0.9 m3.
The piston moved freely and heat was transferred to expand,
resulting in a final temperature of 350oC.
(1) Initial temperature (2) Total mass of H2O (3) Final volume (4)
Marked on the P-v lead

A piston-cylinder device initially contains 75 g of saturated
water vapor at 340 kPa . A resistance heater is operated within the
cylinder with a current of 0.6 A from a 300 V source until the
volume doubles. At the same time a heat loss of 7 kJ occurs.
Part A)Determine the final temperature (T2).
Part B)Determine the duration of the process.
Part C)
What-if scenario: What is the final
temperature if the piston-cylinder device initially contains
saturated liquid water?

A cylinder with a moveable piston holds 1.20 mol of argon at a
constant temperature of 295 K. As the gas is compressed
isothermally, its pressure increases from 101 kPa to 145 kPa.
(a) Find the final volume of the gas. (answer in:
m3)
(b) Find the work done by the gas. (answer in: kJ)
(c) Find the heat added to the gas. (.. kJ)

1-kg water in a frictionless piston-cylinder device is initially
at 250°C and 300 kPa (state
1). A total of 700 kJ of work is done ON the water
in order to isothermally reduce its volume to
1/20 of its initial volume (state 2). Determine the magnitude and
direction of the heat transfer
involved in this process.
Answer: -1147 kJ.

H3.3 A frictionless piston-cylinder device contains 2 kg of H2O
initially at T1 = 300◦C and p1 = 5 bar. The device is cooled at
constant pressure until the volume is ∀2 = 0.5 m3 . Assume a
quasiequillibrium process which occurs slowly with no acceleration
as the piston moves. Kinetic and potential energy effects are
negligible. Determine: a. work [kJ] during process (indicate
magnitude and direction) b. heat transfer [kJ] during process
(indicate magnitude and direction)

The specific volume of water at atmospheric pressure (taken to
be 100 kPa) at 600 degrees C is:
Select one:
a. 0.4011 m3/kg
b. 0.038378 m3/kg
c. 0.001043 m3/kg
d. 1.6941 m3/kg
e. 4.0279 m3/kg
f. Insufficient information to answer question

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