quiz 4 - Yourresponsehasbeensubmittedsuccessfully....

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Your response has been submitted successfully.   Points Awarded  6 Points Missed  14 Percentage  30% 1. Why are good thermal conductors generally good electric conductors also? A. The molecules in both don’t move  around very much. B. The answer depends on the specific  metal. C. Heat and electricity are the same  things. D. Electron motion is responsible for  determining both properties. Points Earned: 0/1 Correct Answer: D Your Response: A 2. You have three incandescent light bulbs that are each consuming 50 W (50 watts) of power. Bulb #1 is a 50W  halogen bulb operating at its designed power level. Bulb #2 is a three-way bulb, with 50W, 100W, and 150W  settings, which is presently operating at its 50W setting. Bulb #3 is an ordinary 100W light bulb that is  connected to a dimmer system so that it is only consuming 50 W. Rank these three bulbs from brightest to  dimmest (i.e. put the bulb that that emits the most visible light first). A. #2 (brightest), #3 (middle), #1 (dimmest). B. #1 (brightest), #2 (middle), #3 (dimmest). C. #3 (brightest), #1 (middle), #2 (dimmest). D. #2 (brightest), #1 (middle), #3 (dimmest).
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Points Earned: 1/1 Correct Answer: B Your Response: B 3. “Two objects in thermal equilibrium with a third object are in thermal equilibrium with each other.” Which Law of  Thermodynamics is this? A. Zeroth B. First C. Second D. Third Points Earned: 0/1 Correct Answer: A Your Response: B 4. Wind is one of nature’s ways of transferring energy through A. convection. B. conduction. C. transmission. D. radiation. Points Earned: 1/1 Correct Answer: A Your Response: A 5.
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Which temperature scale has 373 as the boiling point of water? A. Fahrenheit B. Kelvin C. Celsius D. Centigrade Points Earned: 1/1 Correct Answer: B Your Response: B 6. Some scientists assert that there would be no life on earth if ice did not have a molecular structure with a lot of  open space because A. the density of ice would be greater than water and lakes  would freeze solid - from the bottom up. B. ice would be so light that it could never form, leaving  too much water on the Earth’s surface. C. ice would be less dense than it is now and float too  much D. ice would be denser than water and having a solid sink  in its own liquid form would violate the conservation of  energy. Points Earned: 0/1 Correct Answer: A Your Response: B 7. To make it less likely that a car engine will “knock” (have its fuel/air mixture ignite too early), the engine is  designed so that
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A. the fuel/air mixture is not compressed too tightly. B.
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This note was uploaded on 06/21/2010 for the course PHY 120 taught by Professor D.nolen during the Summer '09 term at Parkland.

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quiz 4 - Yourresponsehasbeensubmittedsuccessfully....

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