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The relative humidity, RH, at sea level can be calculated from measured values of the dry-bulb temperature, Tdb, and the wet-bulb temperature Twb by (temperatures in degrees Celsius):
where VP is the vapor pressure given by: VP
SVP is the saturated vapor pressure given by:
Write a user-defined
(a) Tdb=75°F, Twb=69°F. (b) Tdb=93°F, Twb=90°F.
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Chapter 7 Solutions
Matlab
- The volume V of a given mass of a gas varies directly as the temperature T and inverselyas the pressure P. If V = 322.0 in.3 when T = 230° and P = 10 lb/in.2, what is the volumewhen T = 230° and P = 10 lb/in.2?arrow_forward10) The Hurricane Hunters took the following measurements from a hurricane over They found that the air pressure and wind speed are related in the following way: y=-1.11x+1140 where x is the air pressure in millibars (kPa) and y is the maximum sustained wind speed in knots (nautical miles per hour). several days as it developed: Air Pressure (kPa) Wind Speed (knots) 924 129 933 110 946 67.3 140 958 86 120 991 41.3 100 1,002 35.7 車 920 910 Air Pressure (kPa) a) What does the y-intercept of this function represent? b) Using the model, what would be the wind speed of a hurricane with an air pressure of 969 kPa? Round your answer to the nearest knot. Wind Speed (knots)arrow_forwardAn oxygen cylinder for an oxyacetylene setup registers a pressure of 1,724kPa in the afternoon when the technician is finished using it. The temperatureof the cylinder in the afternoon is 30°C. In the morning the temperature is20°C and the cylinder registers a pressure of 1,668 kPa. Has the cylinderdeveloped a leak?arrow_forward
- 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…arrow_forwardIn cold weather, we feel colder when the wind blows. This is quantified by the wind chill index W, which is supposed to predict how cold we will feel for a given air temperature T, in degrees Fahrenheit, and wind speed V, in miles/hour. The National Weather Service uses the following formula: W=35.74+0.6215T−35.75V^0.16+0.4275TV^0.16, for T≤50 and V≥3. What is the wind chill index when the air temperature is 25 degrees and the wind speed is 18 miles/hour?Answer: Calculate the partial derivatives WT and WV when T=25 and V=18.WT= WV= Use your answer above to do the following question: When the air temperature is 25 degrees, estimate the change in the wind chill index if the wind speed increases by 2 miles/hour from 18 miles/hour.Answer:arrow_forwardEvaluate pa-wa 1 315 (1–t)° dt a. 2.4006 Ob. 0.08709 C. 1.4006 Od. 3.4006arrow_forward
- 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: Part (a). The resistor in a radio circuit was measured to be 6000 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 versu v. 2.5 25 2 2 1.5 1.5 05- 05- 1000 2000 3000 4000 5000 6000 7000 1000 2000 3000 4000 5000 6000 7000 OGraph 1 OGraph 2 2.5 2 1.5 1.5 0.5 0.5 1000 2000 3000 4000 5000 6000 7000 1000 2000 3000 4000 5000 6000 7000 OGraph 3 OGraph 4 III. What happens to the current when voltage increases? O As the resistance increases, so does the current. O As the voitage increases, so does the resistance. O As the voltage increases,…arrow_forwardFind mZG. I 5/3 mZG = Submit % Warrow_forward
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