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Phy 121
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Question Form_labelMessages **
Energy Conversion ?
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• For each set of 5 trials, find the mean and standard deviation of the 5 distances. You may use the data analysis program or any other means you might prefer.
• In the space below, report in five comma-delimited lines, one for each set of trials, the length of the rubber band, the number of dominoes supported at this length, the mean and the standard deviation of the sliding distance in cm, and the energy associated with the stretch.
• You might choose to report energy here in Joules, in ergs, in Newton * cm or in Newton * mm. Any of these choices is acceptable.
• Starting in the sixth line specify the units of your reported energy and a brief description of how your results were obtained. Include your detailed calculations and specific explanation for the third interval. Be sure to give a good description of how you obtained the energy associated with each stretch:
Your answer (start in the next line):
7.5, 2, 16.2, +- 0.88,
7.8, 4, 12.4, +-1.08,
8.3, 6, 11.5, +-0.39,
8.6, 8, 9.92, +-0.26,
8.8, 10, 9.1, +-0.23,
?????????? I am not sure how to calculate the energy! HELP!
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This is very similar to calculations done in the first force vs. displacement lab exercise.
How much force does it take to support a domino?
Between the 7.5 cm length and the 7.8 cm length, the force increases from that required to support two dominoes to the force required to support four dominoes. What therefore is the average force, and how much work does that average force exert during the .3 cm pullback from the 7.5 cm length to the 7.8 cm length?
You need to do a similar calculation for every interval of the pullback. These calculations will be the basis of your energy totals.
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