Question

Which of the following is not a statement of the second law of thermodynamics? a. A heat engine can never be 100% efficient. b. In a thermally insulated environment, the entropy of the environment decreases. c. The universe tends to move in a direction of increasing disorder. d. Perpetual motion machines are impossible. e. Heat spontaneously flows from a high temperature region to a low temperature region.

          Which of the following is not a statement of the second law of
thermodynamics?
a.
A heat engine can never be 100% efficient.
b.
In a thermally insulated environment, the entropy of the
environment decreases.
c.
The universe tends to move in a direction of increasing
disorder.
d.
Perpetual motion machines are impossible.
e.
Heat spontaneously flows from a high temperature region to a low
temperature region.
        
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Added by Tina G.

University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Which of the following is not a statement of the second law of thermodynamics? a. A heat engine can never be 100% efficient. b. In a thermally insulated environment, the entropy of the environment decreases. c. The universe tends to move in a direction of increasing disorder. d. Perpetual motion machines are impossible. e. Heat spontaneously flows from a high temperature region to a low temperature region.
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Transcript

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00:01 So here we need an three body diagram.
00:03 So here is the md so that is mdg here is the tension force and it goes down so mda is gonna be the mdg minus the tension force t so same tension force here so here is the tension force t1 so this mca will be the t minus t1 t minus t1 and of course the friction fc minus d friction similarly with this b so it's mba is equal to t1 minus t2 minus the fb and for an m a so this will be t2 minus the friction force of a.
01:05 So if we sum up, then our acceleration is going to be the mdg minus the friction.
01:15 So mu times and g we can take common.
01:19 So that will be the mc plus mb plus m a over the total mass.
01:28 So that will be the a plus b plus c and plus d.
01:38 Here g we will take 10...
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