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Unformatted text preview: Answers to Period 1 Exercises E.1 How many gallons of gasoline would each vehicle require to go 245 miles? (a) 50 miles on (b) 50 miles on (c) 50 miles on 2.25 gallons 3.5 gallons 6.5 gallons a) 2.25 gal x 245 miles = 11.0 gal 50 miles b) 3.5 gal x 245 miles = 17.2 gal 50 miles c) 6.5 gal x 245 miles = 31.9 gal 50 miles E.2 The British thermal unit (BTU) is a common unit of measurement for thermal energy. If one gallon of gasoline contains 126,000 BTU's, what is the energy content of 15.5 gallons of gasoline? a) 8.13 x 10 3 BTU's b) 8.13 x 10 4 BTU's c) 1.95 x 10 5 BTU's d) 1.95 x 10 6 BTU's e) 1.95 x 10 7 BTU's 126,000 = 1.26 x 10 5 1.26 x 10 5 BTUs x 15.5 gal = 19.5 x 10 5 BTUs 1 gal 19.5 x 10 5 BTUs = 1.95 x 10 6 BTUs E.2 = d E.3 What is the efficiency of an energy conversion process that requires 1,600 joules of energy and produces 400 joules of wasted energy? a) 25% b) 30% c) 50% d) 75% e) 400% If 400 joules of wasted energy are produced, the useful energy is 1,600 J – 400 J = 1,200 J Efficiency = Useful Energy Out = 1,200 J Total Energy In 1,600 J = 3/4 = 75% E.3 = d E.4E....
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.
 Winter '11
 Staff
 Energy

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