Question #5c358
1 Answer
Apr 17, 2016
The weight of S is 16N
Explanation:
You need to consider moments about the fulcrum (the knife edge). Looking at the weights on the right hand side (clockwise moments).
The moments are:
10N×0.2m -the weight acting at the centre of the rod which is 20cm from the fulcrum; and8N×0.35m -the 8N weight that is 35cm from the fulcrum.
So total =
For the system to be in equilibrium, this must equal the anticlockwise moments due to the unknown solid =
Hence
so