weeeman Posted June 4, 2012 Share Posted June 4, 2012 Got a question on a past paper and completely forgot how to do it. 3 particles have speeds 935m/s 743m/s and 312m/s. Calculate rms speed. Can anyone help Link to comment Share on other sites More sharing options...
elfmotat Posted June 4, 2012 Share Posted June 4, 2012 Square each speed, add them together, divide by 3, then take the square root. [math]v_{rms}=\sqrt{\frac{1}{n}\sum_{i=1}^n (v_i)^2}[/math] where vi is the speed of the i'th particle (i.e. i=1,2,3...) and n is the number of particles. Link to comment Share on other sites More sharing options...
weeeman Posted June 4, 2012 Author Share Posted June 4, 2012 thank you very much. I am lucky enough to have the markscheme and so i can see this is correct although i will not have the markscheme in my exams which is a little problem haha Link to comment Share on other sites More sharing options...
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