A small ball of mass 0.55 kg is attached to one end of a 2.00 m long massless rod, and the other end

美國高中 AP Physics C ME HW44 #2
A small ball of mass 0.55 kg is attached to one end of a 2.00 m long massless rod, and the other end of the rod is hung from a pivot. When the resulting pendulum is 25° from the vertical, what is the magnitude of the torque about the pivot?

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