Recent content by alias99

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    Mass Moment of Inertia of Triangle about its tip

    nvn, you're right.. I made 3 mistakes :redface: 1. should be Z-axis through T 2. I missed rho in an equation..haha.. 3. I used 7860 instead of the correct density, 7820 I did it by luznyr's method and got his answer..Thank you very much for your help nvn, you saved me :smile:
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    Fourier cosine series of cos(x) from x=0 to Pi

    Great! Thanks a lot tiny-tim :biggrin:
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    Mass Moment of Inertia of Triangle about its tip

    Hi luznyr, Nice work :) I'm just a bit confused here, because I did it by another method and got a slightly different answer.. Consider a thin vertical strip with area dA = x / 100 * 80 * dx therefore volume dV = x / 100 * 80 * dx * t and IT = integral ( r^2 dm) over volume = integral...
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    Fourier cosine series of cos(x) from x=0 to Pi

    Hi tiny-tim! :smile: (reminds me of the Nudie juices..hmm) Thanks for your response ;) You're right, I do need to learn my identities :-p I can now evaluate the integral much easier (Lol... funny thing is I did manage to get a result by IBP.. it looked like it would have continued...
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    Fourier cosine series of cos(x) from x=0 to Pi

    Homework Statement Find the Fourier cosine series for f(x) = cos x, 0 < x < Pi EDIT: I believe we are talking about a half-range extension.. Homework Equations Fourier cosine series: f(x) = a0/2 + Sum(n = 1 to infinity) (an * cos (nx)) where a0 = 2/L * integral (x = 0, x = L)...
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    Strength of materials question

    Hi mathmate, following your logic (which seems very reasonable), I get F1 = 1200kN and F2 = 120kN, therefore F1 + F2 = 1320kN I can't seem to convert this to 1.56MPa to verify my answer.. could you please help? Thank you ;)