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Duplicate of Laws of Thermodynamics Flashcards | StudBud
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Duplicate of Laws of Thermodynamics
Duplicate of Laws of Thermodynamics
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1
What is another word for entropy?
enthalpy
a trophy
randomness
heat
2
Conservation of energy means that
energy can be created
energy can change forms, but not be created or destroyed
energy is consistently the same form
energy can be destroyed
3
Is there an exception to entropy?
yes
no
4
What is thermal equilibrium?
same temperature
same state
same volume
same pressure
5
What is W?
heat
friction
temperature
work
6
Heat travels from hot to cold
True
False
7
What happens at absolute zero?
all kinetic energy is high
no more heat can be extracted
there is a bit more heat to extract
all thermal motion is high
8
Natural systems tend to proceed in the direction of increasing order.
True
False
9
Entropy is a probability statement, a system can _____.
travel from cold to hot
reach absolute zero
possibly become ordered on its own
possibly become disordered on its own
10
In order for entropy in a system to decrease, the entropy of the surroundings must
must reach absolute zero
also increase
must decrease
11
What is the 3rd Law?
we cannot remove all the energy from matter
heat travels from cold to hot
temperature and entropy increase constantly together
heat travels from hot to cold
12
Carnot's efficiency tells us the maximum amount of input energy that can be converted to work
True
False
13
Carnot's efficiency is based directly on
Newton's first law
the Temp. difference between the hot reservoir and cold sink
how hot the hot reservoir is
How cold the cold sink is
14
Salt allowed our ice to be colder than normal, this allowed heat to transfer more efficiently.
True
False
15
You put a balloon with gas on a heater. Given that it doesn't pop, what happens?
all heat does work on the balloon
all heat increases the internal energy
Some work is done, some heat increases the internal energy
16
Even under ideal conditions, heat engines can never be perfectly efficient.
True
false
17
Order in a system is maintained by
allowing natural processes to take control
decreasing entropy somewhere else
reaching temperature maxima
increasing disorder somewhere else
18
What is the second law about?
God
heat
entropy
physics
19
The 1st law of thermodynamics ____ have exceptions.
cannot
can
20
What is the exchange of energy called?
pressure
physics
heat
temperature
21
How many laws of thermodynamics are there?
7
0
3
2
22
What is it when energy flows from more order to less order?
heat
entropy
sin
bugs
23
What is the first law predicated on? (or similar to, or based on)
same states
relativity
conservation of energy
24
as the thermal motion of atoms approaches zero, the
the object moves
kinetic energy approaches its max
the object is at rest
the kinetic energy approaches zero
25
Cold traveled from the ice to the ice cream mixture
False
True
26
as the kinetic energy approaches zero, the
the temperature approaches its lower limit
the thermal motion of particles reaches its max
things move fast
temperature reaches its upper limit
27
The hot reservoir and cold sink are at thermal equilibrium. This machine is _____ efficient
not
very
28
heat engines require a ________ and a __________.
heat reservoir and a cold sink
heat reservoir and a cold bridge
exhaust
heat bridge and a cold sink
29
The third law of thermodynamics states that
heat travels from hot to cold
heat added = internal energy + Work done by the system
every system is at absolute zero at some point
no system can reach absolute zero
30
When might entropy decrease?
when Mr. Brecht is married
when a source feeds energy to the system
when Jesus returns
when there is no heat
31
What is a heat reservoir?
water tank
the part of the system of interest with the higher T
a battery
32
you put an filled, rigid, airtight can on a hotplate and add energy to the can. What happens?
all heat does work on the can
The can does work, some heat raises internal energy
all heat goes into raising the internal energy
33
Which law is this?
3rd law
0th law
1st law
2nd law
34
Decreasing entropy is like a trade-off. Energy must be ____ in order to reorganize a system.
used
allowed to escape
produced
released
35
The first law says that heat added is either work or internal energy.
False
True
36
you add 10J to a system that does no external W. How much will the E of the system go up?
20J
it won't
10J
37
Heat engines can ______ perfectly efficient
sometimes be
never be
always be
38
What branch of physics are we studying?
Thermodynamics
Modern Physics
Electricity and Magnetism
Classical Mechanics
39
The higher the steam temperature driving a motor the lower the efficiency of power production.
False
True
40
A
heat engine
is any device that changes internal energy into mechanical work.
True
False
41
the value of absolute zero is
0 on the Kelvin scale and -273 degrees on the Celsius scale
373 on the Kelvin scale and 273 degrees on the Celsius scale
0 on the Kelvin scale and 0 degrees on the Celsius scale
0 on the Kelvin scale and -100 degrees on the Celsius scale
42
Which is more probable, a thrown deck of cards landing in a stack or landing in a large mess?
The second option (increasing entropy)
The first option (decreasing entropy)
43
What is a cold sink?
where the energy flows from in a system
when the hot water has run out
where the energy travels to in a system
when the cold water has run out
44
An engine with a large temperature difference between the heat reservoir and the cold sink is
less efficient than with a small T diff
more efficient than with a small T diff
