HW #4-1-solutions

# HW #4-1-solutions - pasha(sep635 HW 4-1 Antoniewicz(56445...

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pasha (sep635) – HW 4-1 – Antoniewicz – (56445) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 of 3) 2.0 points Ac l im b e rw h o s em a s si s M 1 =5 8k g hangs motionless From a rope. What is the magnitude oF the tension in the rope? Use g =9 . 8m / s 2 . Correct answer: 568 . 4N. Explanation: Since there is no net Force experienced in the y-direction, the tension must balance the weight. T 1 = M 1 g T 1 =(58kg ) (9 . / s 2 )=568 . 4N 002 (part 2 of 3) 2.0 points Later, a di f erent climber whose mass is M 2 = 90 kg hangs From the same rope. Now what is the magnitude oF the tension in the rope? Correct answer: 882 N. Explanation: We can make use oF the same argument as in part 1. T 2 = M 2 g T 2 =(90kg ) . / s 2 )=882N 003 (part 3 of 3) 4.0 points Compare the physical state oF the rope when it supports the heavier climber to the state oF the rope when it supports the lighter climber. Which statements about the physical state oF the rope are true? Check all that apply. A Because the same rope is used, the tension in the rope must be the same in both cases. B The interatomic bonds in the rope are stretched more when the rope supports the heavier climber than when the rope supports the lighter climber. C The rope is slightly longer when it supports the heavier climber than when it supports the lighter climber. Correct answer: B, C.

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HW #4-1-solutions - pasha(sep635 HW 4-1 Antoniewicz(56445...

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