Nigel's Seesaw

Classical Mechanics Level 1

Nigel weighs 133 pounds and sits 6 feet from the fulcrum of a seesaw. He balances with Shawn if Shawn sits 7 feet from the fulcrum. How much does Shawn weigh?

Note: If your answer is 101 pounds, write your answer as 101.


The answer is 114.

Terry McTerrier by Terry McTerrier , 21, USA

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2 solutions

Ravik Ganguly
Apr 17, 2014

According to the law of moments,

Moment in clockwise direction = Moment in anticlockwise direction

Therefore, 133*6 = Shawn's weight *7

Shawn's weight = 114 pounds Ans.

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Hello,

just use this centre of mass formula,

m1r1 = m2r2

133(6) = 7m2

m2 = 798 / 7 = 114

thanks...

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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