Question

A uniform metre rule can be
balanced at the 40 cm mark
when a mass of 50 g is hung
from one of its ends. The mass
of the metre rule is :​

Answer 1

Answer:

Actually I don't understand what you are trying to say, please send me a picture of the questions.

Answer 2

Answer:

Here is the answer---

•¶ Refers to the attachment for the Question.

Let the weight of the half metre rule be x gf and it acts at the 40 cm mark (centre of gravity).

Now,

•Acticlockwise moment = x * 4

•Clockwise moment = 50 * 51

In equilibrium,

Anticlockwise moment = Clockwise moment

•4x = 50*51

x = 637.5 gf.

Thus, the weight of the metre rule is 637.5 gf.

•We know, one gf is the force acting on the body of mass 1 grams, thus mass of the body is 637.5 grams.