Homework Help: Physics

Posted by Help on Monday, October 3, 2011 at 7:36pm.

Tarzan, who weighs 917 N, swings from a vine through the jungle. How much work is done by the tension in the vine as he drops through a vertical distance of 3.85 m?

Simply calculating;

W=(917N)*(3.85m)= 3530.45 J

Isn't working, I'm not sure how to apply the work equation.

Physics - Damon, Monday, October 3, 2011 at 8:15pm
Zero
The tension in the vine is perpendicular to the motion at every point of the path so the vine does NO work. The kinetic energy at the bottom is equal to m g times the drop distance.
Physics - Damon, Monday, October 3, 2011 at 8:17pm
To emphasize because this is vital:
Work done = force component IN THE DIRECTION OF MOTION times the distance moved.

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