APFIVE Torque and Rotational Equilibrium
A seesaw consists of a uniform plank of mass 10 kg and length 4 m, pivoted at its center. A child of mass 30 kg sits 1.5 m from the pivot. What torque must be applied to keep the system in rotational equilibrium?
A
294 N·m
B
441 N·m
C
0 N·m
D
147 N·m
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