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The specialized plumbing wrench shown is used in confined areas (e.g.. under a basin or $\operatorname{sink}$ ). It consists essentially of a jaw $B C$ pinned at $B...

Question

The specialized plumbing wrench shown is used in confined areas (e.g.. under a basin or $\operatorname{sink}$ ). It consists essentially of a jaw $B C$ pinned at $B$ to a long rod. Knowing that the forces exerted on the nut are equivalent to a clockwise (when viewed from above) couple with a magnitude of 135 lb-in., determine ( $a$ ) the magnitude of the force exerted by pin $B$ on jaw $B C,(b)$ the couple $\mathbf{M}_{0}$ that is applied to the wrench.

The specialized plumbing wrench shown is used in confined areas (e.g.. under a basin or $\operatorname{sink}$ ). It consists essentially of a jaw $B C$ pinned at $B$ to a long rod. Knowing that the forces exerted on the nut are equivalent to a clockwise (when viewed from above) couple with a magnitude of 135 lb-in., determine ( $a$ ) the magnitude of the force exerted by pin $B$ on jaw $B C,(b)$ the couple $\mathbf{M}_{0}$ that is applied to the wrench.



Answers

A machinist is using a wrench to loosen a nut. The wrench is 25.0 cm long, and he exerts a 17.0-N force at the end of the handle at 37$^\circ$ with the handle ($\textbf{Fig. E10.7.}$) (a) What torque does the machinist exert about the center of the nut? (b) What is the maximum torque he could exert with this force, and how should the force be oriented?


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