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**Unformatted text preview: **force has a larger moment arm and hence larger torque the taller the walls. b) Consider the torques on one of the walls. H is the horizontal force exerted by the roof, as considered in part (a). B is the horizontal force exerted by the buttress. Now the angle is , 40 so N 5959 40 tan 4 = = w H . B ) B( ) H( N 7900 and m 30 m 40 ground at the axis , = =-=...

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