Ch4-HW1-solutions

# Ch4-HW1-solutions - louey(cal2859 – Ch4-HW1 – florin...

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Unformatted text preview: louey (cal2859) – Ch4-HW1 – florin – (56930) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points A climber whose mass is M 1 = 46 kg hangs motionless from a rope. What is the magnitude of the tension in the rope? Use g = 9 . 8 m / s 2 . Correct answer: 450 . 8 N. 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 = (46 kg)(9 . 8 m / s 2 ) = 450 . 8 N 002 (part 2 of 3) 10.0 points Later, a different climber whose mass is M 2 = 78 kg hangs from the same rope. Now what is the magnitude of the tension in the rope? Correct answer: 764 . 4 N. Explanation: We can make use of the same argument as in part 1. T 2 = M 2 g T 2 = (78 kg)(9 . 8 m / s 2 ) = 764 . 4 N 003 (part 3 of 3) 10.0 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. Explanation: The tension in the rope is not the same in both the cases. This is because of the fact that the two masses are different and hence a different level of tension is required to balance the weight, which acts downward....
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Ch4-HW1-solutions - louey(cal2859 – Ch4-HW1 – florin...

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