Question

Question #b93f4

Answer 1

(1) 100 N

Explanation:

Let the reactionary force exerted by each of the two fixed wall AB and AC on two ends of the rod (perpendicular to the plane of the walls) be `R` N.

The line of action of each of these two forces will be inclined with the vertical line passing through the CG of the rod at an angle `60^@`

So the vertical component of each reactionary force will be `Rcos60^@` and the total force of reaction (upward) will be `=2Rcos60^@=2Rxx1/2=R` N.

This total force of reaction will be just equal and opposite to the weight of the rod of mass 10kg.
So `R=10kgxxg=10kgxx10m"/"s^2=100N`

Hence the option (1) is the answer.