Suppose two systems A and B with heat capacities CA and CB ,assumedconstant,
and initial temperatures TA and TB are brought into contact sothatthey can ex-
change heat. If CA>>CB , is the equilibrium temperaturecloserto TA or TB ? What
is the equilibrium temperature if CA = CB ? Is thisprocessreversible, or irreversible?

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An 8-g iron ball bearing initally at a temperature T = 50o C is dropped into a large (assume infinite) bucket of water at T = 10o C.

1)
Approximately how much energy flows into the water from the bearing before an equilibrium temperature is reached? (Iron has an atomic weight = 56 g/mole.)

18 J
60 J
140 J
820 J
2700 J

2)
Compare the time t50->40 needed to cool the bearing from 50o C to 40o C, with time t20->10 needed to cool from 20o C to 10o C.

t50->40 < t20->10
t50->40 = t20->10
t50->40 > t20->10

3)Say that a solid glass window conducted heat away from your house at a rate of 1 W on a cold day. If you used a window twice as thick, twice as wide, and twice as high, what would be the heat loss through the window?
1/2 W
1 W
2 W

4)
Two perfume bottles are opened in a very still room (neglect all air turbulence). Assume the molecules from perfume A have molecular weight 130 g/mole; the perfume B molecules have 200 g/mole. Under the assumption that the molecules have approximately the same mean-free path (e.g., they are approximately the same size), compare the times tA and tB for the two perfumes to diffuse to the edges of the room.

tA = 0.65 tB
tA = 0.81 tB
tA = tB
tA = 1.24 tB
tA = 1.54 tB

5)
What is the chance that for 30 random spins, 29 will be up?

1/30
30 / 230
29 / 600
(29/900) / 230
none of the above

Please solve the following problem, indicating your response on a Word document and submitting the document via File Upload.

Using the following formula, solve the problem below, and show your work.

TWA = CaTa + CbTb + ... + CnTn
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TWA	=	Time-Weighted Average
Ca	=	Concentration of contaminant during the sampling period "a"
Ta	=	Time of sampling period "a"
Cb	=	Concentration of contaminant during the sampling period "b"
Tb	=	Time of sampling period "b"
Cn	=	Concentration of contaminant during the sampling period "n", where "n" is the last of a series of contaminants
Tn	=	Time of sampling period "n"

Note: All concentrations are in parts contaminant per million parts of air or milligrams of contaminant per cubic meter of air.

Air Sampling Problem: You are an industrial hygienist that is conducting personal sampling on a worker who is overseeing a production process involving use of toluene (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 200 parts per million (ppm)). You are able to measure the following exposures:

500 ppm for 1 hour
100 ppm for 4 hours
225 ppm for 3 hours

What is the calculated TWA? What would you tell plant management in terms of exposure to toluene and compliance with the PEL?

Two substances, A and B, initially at different temperatures, come into contact and reach thermal equilibrium. The mass of substance A is 6.04g and its initial temperature is 20.6?C. The mass of substance B is 25.7g and its initial temperature is 52.0?C. The final temperature of both substances at thermal equilibrium is 46.9?C.

If the specific heat capacity of substance B is 1.17 J/g??C, what is the specific heat capacity of substance A?

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