quiz1sol - September5,2007 PHY2053 Quiz1 Chapter2 Name:UFID:

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PHY2053  Quiz 1 Chapter 2 Name:                                   UFID: 1. (5 pts) A car travels at 30 mi/h for 40 minutes and then 40 mi/h for 45 minutes. How  much distance the car travels in total? 40min=40min × (1h/60min)=2/3h 45min=45min × (1hr/60min)=3/4h The total distance=30mi/h × 2/3h+40mi/h × 3/4h=20+30=50mile 2. (5 pts) Suppose you leave your house 10 minutes before the class starts and head for  the university by bike. The university is 2.8 km away from your house. You run 1.2 km  at a constant speed and then the bike chain comes off. It takes 1 minute and 40 seconds  to fix the chain. After you fix the chain, you run twice as fast. You get to the class just  on time. What is the speed of the bike (in m/s) before fixing the chain? The total time you are on the bike=600s-100s=500s
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quiz1sol - September5,2007 PHY2053 Quiz1 Chapter2 Name:UFID:

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