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P221_2008_week5 - Extra Office Hours/Help EXAM I is on...

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Extra Office Hours/Help EXAM I is on Wednesday in class!!! Tomorrow’s discussion sections with Rex Tayloe will be help sessions for the exam: come with questions! Office hours: DVB Monday 3:00 to 4:00. Rex Tayloe Tuesday 11:00 to 1:00 as usual DVB Tuesday 4:00 to 5:30.
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Chapter 7 examples
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Chapter 7 examples
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Estimate the amount of work performed on a 1200 kg car as it accelerates from rest to 1.2m/s 2 over a distance of 150 m. (20 correct, 3 incorrect; 1 confused; 31 no ans.) 864 Newton Meters W=F*d F=m*a F=1200kg*1.2m/s2=1440N d=150m W=1440*150=216000J (correct) CALM:
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A weight-lifter performs the following three steps in his lift: 1). He raises the barbell to his chest 2). He holds it at his chest for 10 sec. 3). He lowers the barbell back to the ground. Rank algebraically the work performed by gravity in each of the three steps (label them W1, W2 etc.). Repeat the question for the work performed by the weight-lifter. ( 11 correct; 7 incorrect; 7 uncertain; 31 no answer ) Rank Algabraiccally?
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