Question
here is the link
http://www.youtube.com/watch?v=_X72on6CSL0
I've included this question on the assignment just because I think it's kind of cool. A video on YouTube which I think is very good is www.youtube.com/watch?v=_X72on6CSL0. Have a look at it. As the professor speaking tells us near the beginning of the video, you will watch a plucked string that was filmed at 1200 frames/second (fps). The person's hand in the video provides a reasonable sense of scale. Use this to estimate the length of the string. Show your reasoning that leads to the estimate. Near the end of the video we see it very slowly so that you can see the individual frames (it's a bit too fast to count them easily but with a few tries you can get an approximate count). Use this to estimate the speed of the wave on the string. Of course I have no idea of either the linear density nor the tension in the string, so I'll have to make one up. It looks pretty light so let's say the linear density of the string is 2.00 g/m. Use this to find the tension in the string.
Explanation / Answer
a) The length of the string is approximately 1 metre
b) the speed is approximately 180m/s ( this is an approximation and it could be deviant)
c) v=T/
=0.002kg/m
so T=64.8 N
