Question
A uniform metre rule of mass 100g balances horizontally on a knife-edge at the 40cm mark when a mass X is placed at the 20cm mark. Calculate the value of X.
Answers
the mass of the rule acts at the center of mass (50cm)
X * 20cm = 100g * 10cm
X * 20cm = 100g * 10cm
Difficult
50cm
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