Question

A uniform metre scale is in equilibrium position. Calculate the mass of the

ruler.​

Answer 1

Answer:

And the centre of mass of the ruler is at its centre. Therefore, the centre of mass of the ruler is 20cm which is away from the hinge. And it is given that the ruler is in equilibrium position

Answer 2

Answer:

50g

Explanation:

τ = r×F

Let the mass of the ruler be M grams.

Centre of mass of the ruler is at it's center.

Therefore, centre of mass of the ruler is 20 cm

away from the hinge .

It is given that the ruler is in equilibrium position.

Balancing the torques due to the mass of the rod and due to the 40 gram

mass suspended from the ruler about the hinge :

40*25 = M*20

M = 50 grams.

Hence , the mass of the ruler is 50 grams .

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