A 30-M Rod Is Pivoted About Its Left End

question 13

Multiple Choice

A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2-N force is at an angle of 30^o to the rod and causes a cw torque. What is the net torque about the pivot? (Take ccw as positive.)

• A) "18 N·m"
• B) "-18 N·m"
• C) "4.2 N·m"
• D) "-4.2 N·m"

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