As shown, a pipe is anchored to a wall at point A. (Figure 2) During the pipe\'s

Question

As shown, a pipe is anchored to a wall at point A. (Figure 2) During the pipe's installation, several forces are applied to the pipe at different locations. If F1 = 16.61b, F2 = 12.61b, F3 = 13.91b, F4 = 18.01b, d1 = 0.400ft, d2 = 0.700ft , and d3 = 0.700ft, what is MRA, the net moment about point A due to these forces? Assume that moments acting counterclockwise about point A are positive whereas moments acting clockwise are negative. Express your answer numerically in pound-feet to three significant figures.

Explanation / Answer

Given F1 = 16.6lb = 73.84 N F2 = 12.6lb = 56.04 N F3 = 13.9lb = 61.83 N F4 = 18lb = 80.06 N d1 = 0.400 ft = 0.1219 m d2 = 0.700 ft = 0.2133 m d3 = 0.700 ft = 0.2133 m Net moment: M R = (F1 * d2)- (F2*d2)-F4(d3-d1) = (73.84*0.2133)-(56.04*0.2133)-(80.06*(0.2133-0.1219)) = -3.5207 N-m = -2.60 lb-ft (anti clock wise) ? Answer

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