Question

A refrigerator can make heat flow from a low-temperature region to a high-temperature region. Does this violate the 2nd law? Explain in terms of the heat flow statement of the 2nd law and the entropy principle.

Answer #1

A refrigerator with a coefficient of performance of 1.70 absorbs
3.60×104 J of heat from the low-temperature reservoir
during each cycle.
How much mechanical work is required to operate the refrigerator
for a cycle?
How much heat does the refrigerator discard to the
high-temperature reservoir during each cycle?

1) An isentropic flow: a) has no heat transfer, b) does not
allow temperature to change, c) can occur in a real physical
problem, d) can only occur when the fluid is at rest.
2) Based on the first law of thermodynamics (assuming no
chemical reactions, i.e. just a simple gas like air or helium): a)
changing the flow velocity can heat the flow, b) moving a solid
body through a fluid can heat the fluid, c) compressing a perfectly...

Explain why
A) If heat flows from high to low temperatures, the entropy
change in any process cannot be negative.
B) The specific heat of any substance is always lowest in the
vapor (gas) phase.

One statement of the second law of thermodynamics is that
___________.
heat can flow spontaneously only from a hot source to a cold
source
It is possible to convert energy from one form to another
without loss
heat can flow spontaneously from a cold source to a hot
source
It is possible to convert heat entirely into useful work

We understand that heat or thermal energy can flow from one
substance to another, but could it be possible that coldness is an
attribute that flows from one object to another? If this were true,
how would our understanding of temperature change? Explain why heat
must flow from warm to cold.
thank you

During the summer when the temperature can be quite
high you sometimes hear a person say: “The heat is high today.”
What is wrong with this statement? Explain your
answer.

True or False? Explain
a. A well located in a low hydraulic conductivity region can
produce high flow rates if we reduce the well pipe diameter.
b. The drawdown at the well radius includes the hydrodynamic
effect of the pumping and the losses due to the gradual clogging of
the filter and screen opening.

We understand that heat or thermal energy can flow from one
substance to another, but could it be possible that coldness is an
attribute that flows from one object to another? If this were true,
how would our understanding of temperature change? Explain why heat
must flow from warm to cold.
Which term describes the amount of thermal energy required to
melt or freeze 1 kg of a substance? a. specific latent heat of
vaporization b. latent heat of vaporization...

How much heat energy does 50.0 grams of water absorb if its
temperature goes from 22.0 °C to
25.3°C? can you please explain with dymentional analysis?

1. Explain how energy can move spontaneously from a
system of low total energy to a system of higher total
energy.
2. Why is it more common to think of temperature as
being related to the rate of change of energy with respect to
entropy than it is to think of it as being related to the rate of
change of entropy with respect to energy?

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