1. When you get out of a swimming pool and stand dripping wet in a light breeze,

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1. When you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this? a. This is a purely psychological resulting from the way in which sensory nerves in the skin are stimulated. b. 540 cal of heat are required to evaporate each gram of water from your skin and most of this heat flows out of your body. c. Water has a relatively large heat capacity. d. The moisture on your skin has good thermal conductivity. e. The water on your skin is colder than the surrounding air. 2. What is the entropy change associated with the phase transformation of 1.00 Kg oflead from liquid to solid? 3. A refrigerator has a cop equal to 5. The refrigerator absorbs 200 J of energy from the cold reservoir in each cycle, find (a) the work necessary for each cycle and (b) the energy expelled to the hot reservoir. 4. An isothermal process refers to the fact that the remains constant? 5. In a constant-volume gas thermometer, the pressure at 68.0 F is0.980 atm. What is the pressure at 45.0 "C? 6. state the laws of thermodynamics and identify the state functions path independent state variables) associated with each law. 7. In the winter, highway bridges will freeze faster than the adjoining road surfaces. Hence the warning signs for the unwary driver. Why does this phenomenon occur? s. A wood block's length is measured with a seel tape in a room that has atemperature of 20 c. The measurement made with the tape on a day when the temperature the same as the block's original length. Explain your answer. 9. Gas in a container increases its pressure from 1.00 atm to 3.03 kPa while keeping its volume constant. What is the work done (in cal) by the gas if its volume is 0.500 m3 10. alcohol has about one-half the specific heat of water. Compare the temperature increases of the two liquids if equal masses of alcohol and water, in separate beakers, are supplied with the same amount of energy. Bonus An automobile engine operates with an overall efficiency of 12% How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned? Bonus 2: Calculate the total amount of thermal energy that is required to convert ten grams of ice at-30 c to steam at 120.0 C. 2090 Jl0kg C) cice cisteam 2010 J/(kg "c Lf water- 3.33 x 105 Jkg 2.26 x 106 JNkg R (gas constant) 8.314 JIK mol Luv, water kB (Boltzmann's constant 1.381 x 10-23

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