The 50-kg stuntman places a 50-kg uniform 6-meter plank on top of a skyscraper and stands on the tip of it that overhangs the building as shown. What is the approximate distance that the overhang can be extended without disaster?
1) 0.5 m
2) 1 m
3) 1.5 m
If the 6-meter board has a mass of only 25 kilograms, then the maximum overhang distance would be about
5) 0.5 m.
6) 1 m.
7) 1.5 m.
8) 2 m.
Question 2
The heavy boy and light girl are balanced on the seesaw. If they both move inward so that each is exactly half the original distance from the pivot, then the
1) boy's end will move downward.
2) girl's end will move downward.
3) seesaw will remain in balance.
If the fulcrum of the seesaw is repositioned so each can sit at an END of the board and be in balance, then if each moves inward half way the
4) boy's end will move downward.
5) girl's end will move downward.
6) seesaw will remain balanced.
Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho
Paul T. Frankl, Skyscraper bookcase.
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The 300-meter Radio Telescope at Arecibo, Puerto Rico
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