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1. [-I1 Points] WAUNIPHYSAV1 17.P.003. ASK YOURTEACHER (a) At what temperature do the Fahrenheit and Celsius scales have the same numerical value? a (b) At what temperature do the Fahrenheit and Kelvin scales have the same numerical value? a 2. [/1 Points] WAUNIPHYSAV1 17.P.008. ASK YOUR TEACHER PRACTICE ANOTHER Two students in a physics lab have to construct a constant-volume gas thermometer as part of their end of year project. They use dry ice (>78.5C) and boiling methyl alcohol (647C) to calibrate the thermometer: The corresponding values of pressure are 0.360 atm and 1.625 atm. The students plot a pressure versus temperature graph with pressure on the y-axis and temperature on the xaxis. (a) Determine the y intercept and slope of the linear graph that relates the pressure to the temperature. slope atm/\"c :1 y intercept :1 atm (b) What value of absolute zero do the students get from this calibration? C (c) What pressure readings would this thermometer give for the freezing and boiling points of water? freezing point atm :l boiling point |:l atm 3. [-I1 Points] WAUNIPHYSAV1 17.P.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER How large an expansion gap should be Ie between steel railroad mils if they may reach a maximum temperature 32.0\"C greater than when they were laid? Their original length is 10.0 m, The coefcient of linear expansion for steel is 12 x M's/\"C. :lmm 4. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.015. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A uniform thin aluminum metal plate with length ; = 15.5 cm and width w; = 12.0 cm is heated from an initial temperature 7; = 25.0 C to a final temperature 7 = 82.1C. What is the change in area of the plate? The coefficient of linear expansion of aluminum is 25.0 x 10-6/C. To avoid rounding off errors, carry intermediate values to at least one extra decimal place. cm 2 5. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.019. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) If a 700-ml ordinary glass beaker is filled to the brim with ethyl alcohol at a temperature of 3.30C, how much will overflow when their temperature reaches 22.0C? The coefficient of volume expansion for ethyl alcohol is 1100 x 10-6/C. Assume the change in volume of the glass beaker is negligible compared to that of the liquid. mL (b) How much less water would overflow under the same conditions? The coefficient of volume expansion for water is 210 x 10-6/C. Assume the change in volume of the glass beaker is negligible compared to that of the liquid. mL 6. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.020. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A physicist makes a cup of instant coffee and notices that as the coffee cools its level drops 3.00 mm in the ordinary glass cup. Show that this cannot be due to just thermal contraction by calculating the decrease in level if the 350 cm of coffee is in a 7.90-cm-diameter cup and as it cools down from 95.0C to 40.5C. Assume the glass cup does not undergo significant change in volume during the short time this happens. (Most of the drop in level is actually due to escaping bubbles of air.) The coefficient of volume expansion for coffee is the same as for water, which is 210 x 10-6/C. mm 7. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.032. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the block is 2.80 kg, and its initial speed is 1.70 m/s. How much does the block's temperature increase, if it absorbs 78% of its initial kinetic energy as internal energy? The specific heat of iron is 452 J/(kg . C). .C8. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.050. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER To help prevent frost damage, 2.67 kg of OC water is sprayed onto a fruit tree. The latent heat of fusion of water is 79.8 kcal/kg. (a) How much heat will be released by the water as it freezes? kcal (b) How much would the temperature of the 240-kg tree decrease if it lost this amount of heat, given its specific heat is 0.800 kcal/(kg . C), and no phase change occurs? 9. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.060. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER How many kilograms of water must evaporate from a 73.2 kg woman to lower her body temperature by 0.908C? The latent heat of vaporization for water at 37C is 580 kcal/kg and the specific heat of the body at 37C is 0.83 kcal/(kg . C). kg 10. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.066. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Suppose you stand with one foot on ceramic flooring and one on a wool carpet, making contact over a 80.2 cm area with each foot. Both the ceramic and the carpet are 3.50 cm thick and are 10.0 C on their bottoms. At what rate must each foot supply heat to keep the top of the ceramic and carpet at 33.0C? The thermal conductivity of ceramic is 0.84 J/(s . m . .C) and that of wool is 0.04 J/(s . m . C). ceramic tile W wool carpet w 11. [-/1 Points] DETAILS WAUNIPHYSAV1 17.P.068. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A walrus loses heat by conduction through its blubber at the rate of 180 W when immersed in -1.00C water. Its internal core temperature is 37.0C, and it has a surface area of 2.38 m2. What is the average thickness of its blubber? The conductivity of fatty tissue without blood is 0.20 (3/s . m . C). cm12. [I1 Points] WAUNIPHVSAV1 17.P.077. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER At what net rate does heat radlate from a 245-m2 black roof on a night when the roof's temperature is 30.0C and the surrounding temperature is 152C? The emlsslvity of the roof is 0.900. |:]kW