For Questions 12 through 17, give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “ Δ E ¯ th > 0 , W = 0 , ” you are to describe a process that has an increase in thermal energy and no transfer of energy by work. You could write “Heating a pan of water on the stove.”) ∆ E th > 0, W ≠ 0, Q ≠ 0
For Questions 12 through 17, give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “ Δ E ¯ th > 0 , W = 0 , ” you are to describe a process that has an increase in thermal energy and no transfer of energy by work. You could write “Heating a pan of water on the stove.”) ∆ E th > 0, W ≠ 0, Q ≠ 0
For Questions 12 through 17, give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “
Δ
E
¯
th
>
0
,
W
=
0
,
” you are to describe a process that has an increase in thermal energy and no transfer of energy by work. You could write “Heating a pan of water on the stove.”)
Consider the thermodynamic process, A->B->C->A shown above. The heat absorbed during A->B is 591J. If the change in internal energy during B->C is 4146J, What is the change in internal energy in SI units during C->A? Express only the number of your answer with 4 significant figures.
A PHYS 1510 student was working on a robotics project. The joints on the machine they were building were powered
by pistons.
Based on how hot the machine was getting, the student was able to figure out that 2.34 J of thermal energy was
produced by every piston every time the piston was fully extended to 0.4064 m.
What was the force of friction that the piston experienced during every extension?
Assume friction is the only source of thermal energy. Include units in Sl.
Please answer the following question(s):
1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -28°
C and has heat transfer to another environment at 47 ° C?
COP ref
(b) How much work must be done for a heat transfer of 4186 kJ from the cold environment?
W =
kj
(c) What is the cost of doing this if the work costs 10.0 cents per 3.6 × 106 J (a kilowatt-hour)?
Cost in cents =
✓
(d) How many kJ of heat transfer, Qh occurs into the warm environment?
Qh=
kj
Think about what type of refrigerator might operate between these temperatures.
Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.
Chapter 11 Solutions
College Physics: A Strategic Approach (3rd Edition)
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