Waves Practice Problem Set Worksheet Page 33
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47M
P
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ECHANICS
RACTICE
ROBLEM
ETS
9.2
P
C
S
H
HASE
HA NGE AND
PECIFIC
EAT
Below is the saturation curve for temperatures ranging from -30°C to 40°C. Use this
information to solve the following problems. Do not write on the graph, you can use
the saturation curve in your activity guide.
Saturation
Diagram
50
Equilibrium
Curve
40
30
Super-saturated
Region
20
Unsaturated
Region
10
0
0
10
20
30
40
Temperature (C)
1.
Which contains more water vapor, air at 30°C with a relative humidity of 50% or air
3
at 5°C that is saturated? Answer: 30°C by about 7 g/m
3
2.
The air is currently at a temperature of 50°F and contains 4 g/m
of water vapor. Will
the relative humidity be higher or lower if the temperature rises to 68°F and by what
percent? Answer: Lower by about 38%
3.
The air temperature outside is 60°F and it has a relative humidity of 70%. What is the
dew point?
Answer: 9°C
3
4.
A parcel of air is 20°C and contains 7 g/m
of water vapor. What is the relative
humidity of this parcel of air?
Answer: 40%
a. The parcel of air rises into the atmosphere and cools at 7°C/km of altitude. At
what altitude would condensation begin to occur? Answer: 2.2 km
5.
A geologist working in the field drinks her morning coffee out of an aluminum cup.
The cup has a mass of 0.120 kg and is initially at 20.0°C when she pours in 0.300 kg
of coffee initially at 70.0°C. What is the final temperature after the coffee and the cup
attain thermal equilibrium? Assume that coffee has the same specific heat capacity as
water and that the only heat exchange is between the coffee and the aluminum cup.
Answer: 66.0°C
6.
(G14.1) How much heat is required to raise the temperature of 20.0 kg of water from
6
15C to 95°C?
Answer: 6.7 x 10
J
Gamzon & Gregorian-Michaelsen
6/7/16
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