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. (II) A person stands, hands at his side, on a platform that is rotating at a rate of 0.90 rev/s. If he raises his arms to a horizontal position, Fig. 8-55, the speed of rotation decreases to 0.60 rev/s. (a) Why? (b) By what factor has his moment of inertia changed? SURE 8-55 Problems 225
and the temperature is (a) 90°C, (b) -20°C? 52. (II) You have a sample of water and are able to control temperature and pressure arbitrarily. (a) Using Fig. 13-22, describe the phase changes you would see if you started at a temperature of 85°C, a pressure of 180 atm, and decreased the pressure down to 0.004 atm while keeping the temper- ature fixed. (b) Repeat part (a) with the temperature at C Assume that you held the system at the starting ondions long enough for the system to stabilize before saking further changes. 13-12 Vapor Pressure and Humidity 53. (1) What is the partial pressure of water vapor at 30°C if 4. (1) What is the air pressure at a place where water boils at the humidity is 75%? 80°C?
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he raises his ams, his mement ее amaular memtum constant So ー-15 So, memnt of inerhal inoreapes by a. f 1.5***************************************************************************************************
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