Answer:
Option D. 100N.
Step-by-step explanation:
In the attached photo, W is the weight of the rod. We can thus, obtain the value of W as follow:
Clock wise moment = (Wx1) + (100x3)
Anti clockwise moment = 400 x 1
Clockwise moment = Anti clockwise moment
(W x 1) + (100x3) = 400 x 1
W + 300 = 400
Collect like terms
W = 400 – 300
W = 100N.
Therefore, the weight of the rod is 100N.