In a see-saw, two children of masses 30 and 
are sitting on one side of it at a distance 
and 
, respectively, from its middle. Where should a man of mass 
sit to balance it?
from center on the opposite as the children 
from centre on the same side as the children 
from the centre on the opposite side 
from the centre on the same side
Text Solution
Verified by ExpertsA
Let the two children be sitting on the left arm. They will produce an anti-clockwise moment due to their weights about the middle point.
Total Anti-clockwise moment 
To balance it, the man should sit on the right arm (to produce a clockwise moment). Let his distance from the middle be x m .
Then
Clockwise moment 
By thr principle of moments,
Anti-clockwise moment 
Clockwise moment
or 
(on the other side).
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