Problem

(a) Show that the polar radius of gyration rO of the annular area shown is approximately e...

(a) Show that the polar radius of gyration r_O of the annular area shown is approximately equal to the mean radius R_m = (R₁ + R₂)/2 for small values of the thickness t = R₂ – R₁. (b) Determine the percentage error introduced by using R_m in place of r_O for the following values of t/R_m: 1, , and .

Fig. P7.22

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Solutions For Problems in Chapter 7

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