117. Relative Humidity The relative humidity is the ratio (expressed as a percent) of the amount of water vapor in the air to the maximum amount that the air can hold at a specific temperature. The relative humidity, R , is found using the following formula: R = 10 ( 4221 T + 459.4 − 4231 D + 459.4 + 2 ) where T is the air temperature (in ° F ) and D is the dew point temperature (in ° F ). (a) Determine the relative humidity if the air temperature is 50 ° Fahrenheit and the dew point temperature is 41 ° Fahrenheit. (b) Determine the relative humidity if the air temperature is 68 ° Fahrenheit and the dew point temperature is 59 ° Fahrenheit. (c) What is the relative humidity if the air temperature and the dew point temperature arc the same?
117. Relative Humidity The relative humidity is the ratio (expressed as a percent) of the amount of water vapor in the air to the maximum amount that the air can hold at a specific temperature. The relative humidity, R , is found using the following formula: R = 10 ( 4221 T + 459.4 − 4231 D + 459.4 + 2 ) where T is the air temperature (in ° F ) and D is the dew point temperature (in ° F ). (a) Determine the relative humidity if the air temperature is 50 ° Fahrenheit and the dew point temperature is 41 ° Fahrenheit. (b) Determine the relative humidity if the air temperature is 68 ° Fahrenheit and the dew point temperature is 59 ° Fahrenheit. (c) What is the relative humidity if the air temperature and the dew point temperature arc the same?
Solution Summary: The author explains the relative humidity if the air temperature is 50 ° Fahrenheit and the dew point
117. Relative Humidity The relative humidity is the ratio (expressed as a percent) of the amount of water vapor in the air to the maximum amount that the air can hold at a specific temperature. The relative humidity, R, is found using the following formula:
where T is the air temperature (in
) and D is the dew point temperature (in
).
(a) Determine the relative humidity if the air temperature is
Fahrenheit and the dew point temperature is
Fahrenheit.
(b) Determine the relative humidity if the air temperature is
Fahrenheit and the dew point temperature is
Fahrenheit.
(c) What is the relative humidity if the air temperature and the dew point temperature arc the same?
Consider the current flow of electricity within an electrical circuit. The formula of Ohm's Law says that when electric current is flowing through a
resistor, the current i (measured in amps) can be calculated from the voltage v (measured in volts) and the resistance R of the resistor (measured in
ohms).
Complete Part (a) and Part (b) using the given formula:
R
Part (a). The resistor in a radio circuit was measured to be 5000 ohms.
I. What is the formula for the current i in the radio circuit?
Use lower-case letter v for voltage.
IL. Select the graph of your formula for i versus v.
2.5
1.5
1.5
0.5
05
3000 4000 5000 6000
1000 2000 3000 4000 s000 6000
OGraph 1
OGraph 2
25
2.5
1.5
1.5
0.5
0.5
1000 2000 3000 4000 5000 6000
1000 2000 3000 4000 5000 6000
OGraph 3
OGraph 4
II. What happens to the current when voltage increases?
O As the resistance increases, so does the current.
A
O As the voltage increases, so does the resistance.
As the voltage increases, so does the current.
Part (b). The…
3
Find FG.
F
440
G
10
FG =
Chapter 5 Solutions
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