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