STEP 2. In the previous activity you also considered a situation in which a person turned a generator, which in turn lit a bulb. The G/R diagram for this situation is shown below, with a dashed box showing a system consisting of the person, generator, bulb, light receivers and the surroundings. The appropriate values for energy transfers and changes are also shown. Increase in TE +40 J Increase in TE +16 J Increase Heat Interactions in TE Surroundings Energy 40 J +132.5 J Heat Interactions Surroundings Person Energy 16 J Energy 160 J Heat Interactions Generator Surroundings Energy 132.5 J (90%) Contact Push/Pull Interaction Energy 144 J Bulb Decrease in CPE (8%) Energy Electric Circuit Interaction -200 J 11.5 J Light Receivers Light Interaction 3D Increase in energy +11.5 J For the example in STEP 1 we wrote this more general statement of conservation of energy. Let us check if it applies to this case also. Energy transferred into the system Total change in energy of the interacting objects in the system What is the total amount of energy transferred into this system from outside? How do you know? (Remember, energy transfers that take place entirely within the system should not be considered!)
STEP 2. In the previous activity you also considered a situation in which a person turned a generator, which in turn lit a bulb. The G/R diagram for this situation is shown below, with a dashed box showing a system consisting of the person, generator, bulb, light receivers and the surroundings. The appropriate values for energy transfers and changes are also shown. Increase in TE +40 J Increase in TE +16 J Increase Heat Interactions in TE Surroundings Energy 40 J +132.5 J Heat Interactions Surroundings Person Energy 16 J Energy 160 J Heat Interactions Generator Surroundings Energy 132.5 J (90%) Contact Push/Pull Interaction Energy 144 J Bulb Decrease in CPE (8%) Energy Electric Circuit Interaction -200 J 11.5 J Light Receivers Light Interaction 3D Increase in energy +11.5 J For the example in STEP 1 we wrote this more general statement of conservation of energy. Let us check if it applies to this case also. Energy transferred into the system Total change in energy of the interacting objects in the system What is the total amount of energy transferred into this system from outside? How do you know? (Remember, energy transfers that take place entirely within the system should not be considered!)
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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