Problem 641 For the cantilever beam shown in Fig. P-641, what will cause zero deflection at A?
Solution 641
$\dfrac{1}{EI}(Area_{AC}) \, \bar{X}_A = 0$
$\dfrac{1}{EI} [ \, \frac{1}{2}(4)(4P)(\frac{8}{3}) - 2(400)(3)\, ] = 0$
$P = 112.5 \, \text{ N}$ answer
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