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# HW_1 - P112 Spring 2008 Homework#1 Reading 1.1-1.10 2.1-2.5...

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P112 Spring 2008 Homework #1 Reading: 1.1-1.10, 2.1-2.5 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A bicycle, going up hill, travels 10 miles in 1 hour, then, going down hill, it travels 10 miles in 30 minutes. What is the bicycle’s average speed in miles per hour? 2. The official world land speed record is 1228.0 km/h, set in 1997 by Andy Green in a jet engine car. Express this speed in meters per second. 3. Estimate the percent error in measuring a) a distance of about 75cm with a meter stick b) a mass of about 12 g with a chemical balance c) a time interval of about 6 min with a stopwatch. 4. In America, we measure fuel efficiency of our cars by citing the number of miles you can drive on one gallon of gas (mi/gal). In Europe, the same information is given by quoting how many liters of gas it takes to go 100 km (L/100 km). a. My current car gets 21 mi/gal in highway travel. What number (in L/100 km) should I give to my Swedish friend so that he can compare it to his Volvo? b. The car I drove in England last summer needed 6 liters of gas to go 100 km. How many mi/gal did it get? c. If my car has a fuel efficiency, f, in miles/gallon, what is its European efficiency, e, in liters/100 km? (Write an equation that would permit an easy conversion.) 5. A bicycle travels a distance D up a gentle hill at

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