Recent content by mwaso

  1. M

    Undergrad Physics of BP Cuffs: Understand the Pressure Reading

    this really is a physics question! (I think) so, when you measure blood pressure, you wrap a cuff around the subject's arm and fill it with air past the point where the artery is occluded. Then, you listen with a stethoscope as you slowly release the air...you'll be able to hear beats for...
  2. M

    Medical Is Blood Pressure Measurement Accurate in Obese Patients?

    so, when measuring blood pressure, if you use a cuff that's too large for the patient, you get an incorrectly low reading. This doesn't make sense to me. why?
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    Finding the Laplace Transform of f(t)=t using the definition

    Homework Statement using the definition (not the table), find the Laplace transform of f(t)=t Homework Equations definition of Laplace... the integral from 0 to infinity of [(e^-st)*f(t)]dt The Attempt at a Solution first I took the integral of [(e^-st)t]dt by parts and got...
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    Programs Is a Master's Degree a Good Stepping Stone for a PhD in Physics?

    I have an older bro who went this route with math. He had a less than impressive gpa with his BS in physics, found it difficult to get related job, and headed back to grad school a few years later. He didn't get much in the way of financial help at first, but he made it through with his MS in...
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    Differential equations-system of equations, cleaning up the great lakes

    http://images.quickblogcast.com/56158-49218/great_lakes.JPG here's the image that shows the great lakes and their flow rates so you don't have to view the attachment
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    Differential equations-system of equations, cleaning up the great lakes

    Homework Statement The idea of the problem is to find out how long it would take to flush the Great Lakes of pollution. They're set up as a series of five tanks and you are given inflow rates of clean water, inflow rates from the other tanks, and outflow rates. See attached figure...
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    Irrational natural log integral

    Homework Statement the indefinite integral of (1+lnx)^(1/2)/(xlnx) dx Homework Equations n/a The Attempt at a Solution There aren't any x^2 in the root sign, so I don't think it can be a trig substitution. The only logical u sub I see is to let u=lnx. In that case, du=dx/x so the...
  8. M

    Integral of x/(x^4+x^2+1): Solution Attempts

    ahh, wow, that works MUCH better. so that basically leaves me with an inverse tangent, right? good deal. Thanks
  9. M

    Integral of x/(x^4+x^2+1): Solution Attempts

    because if I completed the square at this stage, I'd get the indefinite integral of du/(u+1)^2-u, right? If I do that, I don't see this would help as it still isn't an inverse trig form and I still don't see any candidates for another substitution...
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    Integral of x/(x^4+x^2+1): Solution Attempts

    Homework Statement the indefinite integral of x/(x^4+x^2+1) Homework Equations n/a The Attempt at a Solution I didn't see an obvious u-substitution and it didn't look like a partial fractions candidate to me since the bottom is not easily factored. It doesn't look like any of the...
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    How Can I Solve This Annoyingly Difficult Integral for Homework?

    Homework Statement integrate dx/(1-x^2)^(3/2) The attempt at a solution I first noticed that the derivative of inverse sin equals (1 x^2)^(-1/2) and that my equation is that derivative cubed. However, I had no idea what to do with the cube, so I dicarded that thought. Next I tried...