Question

The 100kg plate is 7m from the Axis of Rotation. Eyebolt 1 (E1) is 5m from the axis; Eyebolt 2 is 3.67m from the axis; Eyebolt 3 is 2.34m from the axis; and Eyebolt 4 is 1m from the axis. The log by itself weighs 50kg and is 7m long. Its mass is evenly distributed. (Hint here: The center of gravity for the log alone is in the middle of the log. So, how long is the moment arm from the axis of rotation to the center of gravity of the empty log?) So, there are two torques that make up the (clockwise) Resistive Torque: The Torque of the Weight and the Torque of the Log. To lift it, the athlete must produce greater torque in the opposite direction (counterclockwise). In other words, the athlete must EXCEED the Resistive Torque!

          The 100kg plate is 7m from the Axis of Rotation. Eyebolt 1 (E1) is 5m from the axis; Eyebolt 2 is 3.67m from the axis; Eyebolt 3 is 2.34m from the axis; and Eyebolt 4 is 1m from the axis.
The log by itself weighs 50kg and is 7m long. Its mass is evenly distributed. (Hint here: The center of gravity for the log alone is in the middle of the log. So, how long is the moment arm from the axis of rotation to the center of gravity of the empty log?)
So, there are two torques that make up the (clockwise) Resistive Torque: The Torque of the Weight and the Torque of the Log. To lift it, the athlete must produce greater torque in the opposite direction (counterclockwise). In other words, the athlete must EXCEED the Resistive Torque!

Added by Robert M.

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