A rod of length L is pivoted about its left end and has a force F applied perpendicular to the other end. The force F is now removed and another force F¢ is applied at the midpoint of the rod. If F¢ is at an angle of 30o with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied?
a. F
c. 3F
b. 2F
d. 4F
D
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