The center of a long uniform log is raised to shoulder level while the other end is on the ground. If instead, the end of the log is raised to shoulder level, the work required is

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Quizplus · Accepted Answer

The work required to lift an object is proportional to the height it is lifted. In the first case, the center of the log is lifted to shoulder level, which is half the length of the log. In the second case, the end of the log is lifted to shoulder level, which is the full length of the log. Therefore, the work required in the second case is twice the work required in the first case.

The Center of a Long Uniform Log Is Raised to Shoulder