Question

It's Midnight

I need Serious help

A metre rule is balanced 0cm mark. Find the weight of the rule if 20gf is hung from one end. ​

Answer 1

Let the weight of the half metre rule be x gf and it acts at the 25 cm mark (centre of gravity).

Now,
•Acticlockwise moment = x * 4
•Clockwise moment = 20 * 21

In equilibrium,
Anticlockwise moment = Clockwise moment
•4x = 20*21
x = 105 gf.

Thus, the weight of the metre rule is 105 gf.

•We know, one gf is the force acting on the body of mass 1 grams, thus mass of the body is 105 grams.