# HW_6 - thermodynamically explain Darwin’s frustrations 3...

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Homework Assignment 06 1. A gasoline engine produces 20 hp using 35 kW of energy from the burning of fuel. What is the efficiency of this engine? Is this an efficient engine? Explain. 2. In Voyage of the Beagle , Charles Darwin recounts a time he had difficulty cooking potatoes while traveling in the Andes [1]. The following is an expert explaining his frustrations: “Hence the potatoes, after remaining for some hours in the boiling water, were nearly as hard as ever. The pot was left on the fire all night, and next morning it was boiled again, but yet the potatoes were not cooked. I found out this, by overhearing my two companions discussing the cause, they had come to the conclusion, “that the cursed pot [which was a new one] did not choose to boil potatoes.”” Assuming that the Andes are at an elevation of 13,000 ft, use Table A-16E and Table A-5E,

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Unformatted text preview: thermodynamically explain Darwin’s frustrations. 3. Water at 27°C can exist in different phases dependent upon the pressure. Give the approximate pressure range in kPa for water being in each one of the three phases vapor, liquid or solid. 4. If density of ice is 920 kg/m 3 , find the pressure at the bottom of a 1000 m thick ice cap on the north pole. What is the melting temperature at that pressure? (Take the density of ice to be 920 kg/m 3 , also recall P total = P atm + ΔP ) 5. Sublimation occurs by: a) absorption of energy b.) release of energy c.) None of these Explain your answer! 6. Condensation occurs by: a) absorption of energy b.) release of energy c.) None of these Explain your answer! Due Wednesday June 16, 2010 10:00AM References: 1. Baker, Joanne. 50 Physics Ideas You Really Need to Know . Quercus. London. Water phase diagram...
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HW_6 - thermodynamically explain Darwin’s frustrations 3...

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