Question

A uniform half-meter rod is balanced at 20 cm mark when a weight of 10 gf is [1] Suspended at its one end. The weight of the uniform half-meter rod is:
1. 10 gf

2. 20 gf

3. 30 gf

4. 40 gf​

Answer 1

Answer:

30 gf is the answer

Explanation:

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Answer 2

Given : A uniform half-meter rod is balanced at 20 cm mark when a weight of 10 gf is   Suspended at its one end.

To Find : The weight of the uniform half-meter rod

Solution:

The weight of the uniform half-meter rod = W  gf

uniform half-meter rod  = 50 cm

Hence W lies at center = 50/2  = 25 cm

Distance of W from 20 cm (balanced) mark  = 25  - 20  = 5 cm

Distance of  10 gf  from 20 cm  (balanced) mark  =  20 cm

Clockwise Torque = Anti clock wise torque

10 * 20  = W * 5

=> W = 40 gf

The weight of the uniform half-meter rod is 40 gf

Hence correct option is 4)    40 gf

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