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December 20, 2014

December 20, 2014

Posted by **bob** on Tuesday, June 8, 2010 at 2:08pm.

- physics -
**Gilles**, Tuesday, June 8, 2010 at 8:04pmLet A = the child and B = adult person.

To balance this beam, the moment of the right hand side (B) must equal the moment of the left hand side (A).

M(A) = M(B)

m(A)*g*2.5 = m(B)*g*d(B)

62.5 = 70*d(B)

=> d(B) = 70/62.5 = 1.12m

I hope this will help

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