The boiling temperature of water decreases by about 3°C for each 1000-m rise in altitude. What is the decrease in the boiling temperature in for each 1000-m rise in altitude? (a). K, (b) °F, (c) R
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- (a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?What mass of water at 25.0C must be allowed to conic to thermal equilibrium with a 1.85-kg cube of aluminum initially at 1.50 102C to lower the temperature of the aluminum to 65.0C? Assume any water turned to steam subsequently recondenses.One way to cool a gas is to let it expand. When a certain gas under a pressure of 5.00 106 Ha at 25.0C is allowed to expand to 3.00 times its original volume, its final pressure is 1.07 106 Pa. (a) What is the initial temperature of the gas in Kelvin? (b) What is the final temperature of the system? (See Section 10.4.)
- (a) At what temperature does water boil at an altitude of 1500 m (about 5000 ft) on a day when atmospheric pressure is 8.59104N/m2 ? (b) What about at an altitude of 3000 m (about 10,000 ft) when atmospheric pressure is 7.00104N/m2 ?8. IP A constant-volume gas thermometer has a pressure of 80.3 kPa at -10.0 °C and a pressure of 86.4 kPa at 10.0 °C. (a) At what temperature does the pressure of this system extrapolate to zero? (b) What are the pressures of the gas at the freezing and boiling points of water? (c) In general terms, how would your answers to parts (a) and (b) change if a different constant- volume gas thermometer is used? Explain.1. Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation from 1.5 m² of 1198 deg C.fresh lava into 30 deg C surroundings, assuming lava's emissivity is 1.2. o=5.67x10-8 J/(s m² °C) Use the sign convention for heat leaving or entering the system. ✔KW
- Aluminum has a thermal conductivity of 200 W/(m· C°). The bottom of an alu- minum pot is 2.14 mm thick, has area 0.0314 m2, and sits on a burner whose tem- perature is 280°C, and the pot contains boiling water at 100°C. 4. How much heat is conducted through the aluminum in 105 seconds? 5. How much water boils off in that 105 seconds?16. What is the amount of heat required to melt 100 g of ice completely at -10°C? (5) (a) 6048 cal _(b) 4680 cal (c) 8640 cal (d) 8064 cal 17 A 21 container holds 3 moles of N. at 323 K What is the pressure of the gas inside the container?4. A news report says weather in Jebel Shams reaches a minimum temperature of -4°C. What is the value in kelvin (K) and Fahrenheit scale (°F)? dwith tho function y(x t) = (0.25m)cos(0.30m-x-0.90s-t+n/3). Find
- 9. Will took a 45.0g cube of solid H2O (an ice cube) out of the freezer at -5.00°C and put it on the table in the lab. The ice cube melts by absorbing heat from the air in the room, which changes slightly, but to four significant figures is at a constant 20.00°C, and the melt-water reaches room temperature. a) Start with AS = S to find the total change in entropy for the H2O for this entire process. b) Start with AS = S to find the change in entropy for the air for this entire process. c) Find the total change in entropy for the universe for this process. d) Use the answer from part c) to explain whether or not this process is reversible.Question 12 Suppose the earth was twice its current distance from the sun. Recall, the sun's radius is R_sun=7 x 105 km, with a surface temperature of 5800 K., and our distance from the sun is D = 150 million km. Using the equation to model the temperature of R² the earth, ()¹/4Tsun and remembering you have to work in the absolute temperature scale (OK = -273°C) would you expect it to be twice as hot as earth? half as hot as earth the same temperature as earth 0.7 times as hot as earth? 1.4x as hot as earth9. In an experiment, a 0.290-kg piece of ceramic superconducting material at 19 °C is placed in liquid nitrogen at its boiling point (-195.8 °C) to cool. The nitrogen is in a perfectly insulated flask that allows the gaseous N2 to escape immediately. How much mass of liquid nitrogen will be boiled away? (Take the specific heat of the ceramic material to be the same as that of glass.) grams sst60 s 60 ssfe