during sensible cooling of air. decreases. Select one: a. specific humidity b. wet bulb temperature c. relative humidity
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- 3. The data below shows the environmental temperature at different height: Altitude (m) 0 50 Temperature (°C) 24.00 23.75 100 23.50 150 200 23.25 23.00 Above 200 m, the ambient temperature increases at the rate of +20 °C km*1. (a) A 100-m tall stack emits a plume whose temperature is 24.50°C. Using graphical method and with justification, predict the maximum mixing height of the plume. (b) Describe the type of plume emitted under the conditions mentioned in 3(a).5. A weather balloon is released and later reports a temperature of 8 °C and pressure of 0.900 atm. The surface temperature was 16 °C and pressure 0.995 atm. Determine the atmosphere stability class, assuming the temperature profile is constant.Question:- If you wet your finger and hold it in the air outside, you can tell which direction the wind is blowing. This example shows that: A. melting is a cooling process. B. freezing is a warming process. C. condensation is a warming process D. evaporation is a cooling process.
- 6- A plywood is used as a thermal Insulator in a house. It has a width of 6cm and area of 3m². If the internal temperature is 25C° and the external temperature 50C and the thermal conductivity 0.04 (J/(s.m. Cº), what is the time needed to flow 3 KJ of heat to the house? (2.5/10).4. Taos Ski Valley advertises a vertical drop of 3,281 feet. Use Laplace's law of isothermal atmospheres to calculate the change in air pressure between the top and the bottom. Assume the temperature is 25 °F. The pressure at the base of the ski area is 0.70 atm.5) In the Swiss Alps, the air pressure is relatively low due to the high elevation. Assuming an air pressure of 75 kPa and a temperature of 4°C, how many air molecules will there be in a 1 liter (10-3 m³) bottle? a) 1 x 1022 b) 2x 1022 c) 3 x 1022 d) 4 x 1022 e) 5 x 1022 f) 6 × 1022 6) An alphorn plays a sustained tone at 29 Hz. A second, smaller alphorn produces 120 beats per minutes when played with the 29 Hz instrument. What is the frequency of this second alphorn? a) 2 Hz b) 27 Hz c) 29 Hz d) 31 Hz e) 120 Hz f) 149 Hz Short Answer Question Model an alphorn as an open-closed pipe with a first harmonic (m=1) frequency of 29 Hz. . Sketch the first (m=1) harmonic showing it at two different times. ⚫ Determine the wavelength (in m) of the first harmonic. . What is the length of the pipe (in m)? ⚫ Calculate the frequency (in Hz) of the next two harmonics.
- 16. Microscopic pockets of water continue to exist at (-18°C) and even much lower temperaturesul: A. True. B. False.5. You set an oven to 350 degrees F (180 C). You put uncooked cookies into the oven oma metal ban. Why do the cookies heat up? Does the oven temperature change as the cookies heat up? What happens if you unplug the oven (after it is already set at 350 degrees)?9. A fitness club hires you to talk to their clients about the biomechanics of exercise. One of the clients likes to walk stairs at her office during her lunch hour for exercise. She wants to know if she can burn off the calories from one candy bar (180 kilocalories) by climbing up 1,500 steps of stairs. One kilocalorie equals 4,184 Joules. She weighs 65 kg and the height of one stair is 20 cm. The gross efficiency of her positive work is 25%.