Question

Two solid bodies of equal mass and identical composition, isolated from the surroundings and each other and kept initially at temperature T1 and T2 are brought into thermal contact until they attain thermal equilibrium with each other. Compute the amount of entropy change of the universe in terms of T1, T2, and the heat capacity C_p of each body , assuming the process to take place at constant pressure exerted on them by the environment and show that the entropy indeed increases during the process

Answer #1

Two identical bars, each of mass m and specific heat
c, are initially kept at temperatures
T0and 5T0respectively. The
bars are brought into contact until equilibrium is established.
Assuming the entire experiment took place in thermal insulation
from the surroundings; find the entropy change of the system.

Consider an isolated system containing two blocks of copper with
equal mass. One block is initially at 0oC while the other is at
100oC.They are brought into contact with each other and allowed to
thermally equilibrate. What is the entropy change for the system
during this process? The heat capacity for copper is Cp =
24.5 [J/mol k]

Two finite, identical, solid bodies of constant total heat
capacity per body, Cp, are used as heat sources to drive
a heat engine. Their initial temperatures are T1 and
T2. The reservoirs remain at constant pressure and do
not change phase. Finally afterwards, because of the work done by
the heat engine, the two reservoirs arrive at a common temperature
Tf . First, find the nal temperature Tf
(hint, use the second law to find it). Find the maximum work...

Two copper blocks, each of mass 1.74 kg, initially have
different temperatures,t1 = 18° C and
t2 = 30° C. The blocks are placed in contact
with each other and come to thermal equilibrium. No heat is lost to
the surroundings.
(a) Find the final temperature of the blocks.
°C
Find the heat transferred between them.
J
(b) Find the entropy change of each block during the time interval
in which the first joule of heat flows.
?S1
= J/K...

Consider two bodies with temperature independent heat capacities
C1 and C2, and initial temperatures T1 > T2.
(a) If the two bodies are brought into contact such that the
only heat exchange is between them, what is the final temperature
Tfinal , and what is the change in entropy.
(b) Suppose instead that the difference in temperature between
the two bodies is used to drive an ideal heat engine (Carnot
cycle). In one operation of the cycle some amount of...

1) Describe an example of each of the following that may be
found of your kitchen: Explain how your choice falls into this
category, and if there is a chemical name or symbol for it, provide
that as well. Provide a photo of your example with your ID card in
it. a) a compound b) a heterogeneous mixture c) an element (symbol)
Moving to the Caves… Lechuguilla Caves specifically. Check out this
picture of crystals of gypsum left behind in...

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INNOVATION
Deep Change: How Operational Innovation Can Transform Your
Company
by
Michael Hammer
From the April 2004 Issue
Save
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8.95
In 1991, Progressive Insurance, an automobile insurer based in
Mayfield Village, Ohio, had approximately $1.3 billion in sales. By
2002, that figure had grown to $9.5 billion. What fashionable
strategies did Progressive employ to achieve sevenfold growth in
just over a decade? Was it positioned in a high-growth industry?
Hardly. Auto insurance is a mature, 100-year-old industry...

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