Suppose that 300.0 J of heat is transferred by
conduction from a heat reservoir at a...
Suppose that 300.0 J of heat is transferred by
conduction from a heat reservoir at a temperature of 415.0
K to another reservoir. Calculate the entropy change if
the temperature of the second reservoir is 100.0 K
Consider three engines that each use 2160 J of heat from a hot
reservoir (temperature = 540 K). These three engines reject heat to
a cold reservoir (temperature = 335 K). Engine I rejects 1497 J of
heat. Engine II rejects 655 J of heat. Engine III rejects 1340 J of
heat. One of the engines operates reversibly, and two operate
irreversibly. However, of the two irreversible engines, one
violates the second law of thermodynamics and could not exist. For...
Consider three engines that each use 1695 J of heat from a hot
reservoir (temperature = 565 K). These three engines reject heat to
a cold reservoir (temperature = 325 K). Engine I rejects 975 J of
heat. Engine II rejects 655 J of heat. Engine III rejects 1108 J of
heat. One of the engines operates reversibly, and two operate
irreversibly. However, of the two irreversible engines, one
violates the second law of thermodynamics and could not exist. For...
14) Suppose a low-boiling liquid like ammonia is placed in a
heat reservoir and part of the energy of the surroundings is used
to vaporize the liquid.The adiabatically expanding gas does work by
driving a piston and during the expansion the gas cools until it
condenses to a liquid, the liquid is once again vaporized using
energy available from the surroundings, and the cycle is repeated.
Can such an engine be made operational?
A heat engine operates between a high-temperature reservoir at
610 K and a low-temperature reservoir at 320 K. In one cycle, the
engine absorbs 6800 J of heat from the high-temperature reservoir
and does 2200 J of work.
A) What is the net change in entropy as a result of this
cycle?
Determine
how much
energy in kJ would be transferred if 300.0 grams
of steam (gaseous
water) at 150.0
̊C
is cooled to ice
(solid water)
at -20.0
̊C.
The specific
heat
of steam is
1.86
J/(g∙ ̊C),
the
specific heat
of ice is 2.06
J/(g∙ ̊C),
the heat of fusion of water
is 333
J/g, and
the heat
of vaporization is 2256 J/g.
Heat conduction from a hotter object to a colder object through
a barrier (e.g. warm inside out to cold outside air through a
window) is descrbed by Q?t=kAL|T1?T2| where k is the conductivity
of the barrier, L is the distance the heat has to travel between
hotter and colder objects, A is the total cross sectional area of
the barrier that is perpendicular to heat flow, and T1 and T2 are
the two temperatures. In this problem, you will connect...
2. Understand how much work and heat are transferred in an ideal
heat engine or reverse heat engine.
a) What is the maximum work that I can get from a heat source at
450K and a cold sink at 298K? (0.338 J per joule of heat in at 450
K)
b) How much heat can I get from ideal reverse heat engine per
Joule of energy of work if the outside temperature is 10oC and my
house is at 25oC?...