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course 201
10:25 10/10
`q001. Light moves at 3 * 10^8 meters / second. The neutrinos beat the light by 60 nanosecondsHow far ahead of the light beam was the neutrino beam?
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450mi/(3x10^8 m/s)
724204.8m//(3x10^8 m/s)=.0024s
60 x 10^-9=6^-8
.0024s- 6^-8= .002399s
.0024- .002399s= .000001s
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@& The neutrino beam was 60 ns ahead, not .000001 s ahead.
.000001 s is not an answer to 'how far'.*@
What was the percent difference in the speeds of the two beams? Calculate this based on the information provided in this question, and on the distance traveled by the two beams.
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.0025%
450 mi
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@& You don't show how you calculated that .0025%.*@
`q002. If one swimmer moves 2% faster than another on a 500-meter race, how far ahead is the faster swimmer at the end of the race?
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500 x .02= 10m
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If the slower swimmer moves at an average speed of 1.74 m/s during the race, then what is the average speed of the faster swimmer?
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1.74 x .02= .0348
1.74+ .0348=1.7748m/s
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What is the percent difference between the KE per kilogram of body mass, of the two swimmers?
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Ke= ½(1)(1.74)^2
=1.5138 per kg
Ke=1/2(1)(1.775)^2
=1.57353 per kg
1.5753/1.5138= 4% difference in ke per kg
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&#Good responses. See my notes and let me know if you have questions. &#