PHYS172

# PHYS172 - 1. 3/3 points A climber whose mass is 50 kg hangs...

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1. 3/3 points A climber whose mass is 50 kg hangs motionless from a rope. What is the tension in the rope? tension = 50*9.81 [490] N Later, a different climber whose mass is 65 kg hangs from the same rope. Now what is the tension in the rope? tension = 65*9.81 [637] N 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. [x] [x] The rope is slightly longer when it supports the heavier climber than when it supports the lighter climber. [x] [x] The interatomic bonds in the rope are stretched more when the rope supports the haevier climber than when the rope supports the lighter climber. [_] [_] Because the same rope is used, the tension in the rope must be the same in both cases. 2. 0/1 points Why are two balls connected by a spring a good model for two atoms connected by a chemical bond? [x] [x] If the two atoms get closer together than the equilibrium interatomic distance, they repel each other. [x] [x] If the two atoms get farther apart than the equilibrium interatomic distance, they attract each other. [x] [x] The magnitude of the force one atom exerts on another is proportional to the stretch or compression of the bond between them. [x] [_] Each spring represents a real microscopic coiled metal wire that connects two adjacent atoms. 3. 3/3 points The diameter of a copper atom is approximately 2.28e-10 m. The mass of one mole of copper is 64 grams. Assume that the atoms are arranged in a simple cubic array, as shown in Figure 4.10, on p. 109. Remember to convert to S.I. units. What is the mass of one copper atom, in kg?

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## This homework help was uploaded on 04/17/2008 for the course PHYS 172 taught by Professor ? during the Spring '08 term at Purdue.

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PHYS172 - 1. 3/3 points A climber whose mass is 50 kg hangs...

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