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Question Number 125876 by bramlexs22 last updated on 14/Dec/20

Commented by liberty last updated on 15/Dec/20

$$W=\underset{n\to \mathrm{\infty }}{\mathrm{Lim}}\underset{i=1}{\sum ^n}\rho A\left(x_i^{\ast }\right)\mathrm{\Delta }x$$$$W=\underset{n\to \mathrm{\infty }}{\mathrm{Lim}}\underset{i=1}{\sum ^n}2,250\pi \left(x_i^{\ast }\right)\mathrm{\Delta }x$$$${={\int }_4^{8}2,250\pi \left(x\right)dx=1,125\pi \left(x^2\right)]}_4^8$$$$=1,125\pi \times 48=169,646lb-ft$$$$$$

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