A physical balance has its arms of length 60cm and 40 cm . what weight kept on pan of longer arm will balance an object of weight 100 gf kept on other pan?
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From the principle of moments,
Anticlockwise moment = Clockwise moment 100 gf × 40 cm
= W × 60 cm
So, weight on the longer pan ,
W = 100gf x 40cm/60
= 200gf/3
= 66.67 gf
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