Asked by Sizi

A uniform half metre rule AB is balanced horizontally on a knife edge placed 15cm from A , with mass of 39g at A . What is the mass of rule A.
Answered by Sizi
What is the answer to my question?
Answered by R_scott
the center of mass of the rule is at the center ... 25 cm mark

39 g * 15 cm = m * 10 cm
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