Q.
In the figure, a man of true mass M is standing on a weighing machine placed in a cabin. The cabin is joined by a string with a body of mass m. Assuming no friction, and negligible mass of cabin and weighing machine, the reading of weighing machine is
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a
Mmg /M+m
b
Mmg / M-m
c
Mg
d
mg
answer is A.
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Detailed Solution
For the body , T = ma .............(1)For the cabin with man ,Mg - T = Ma .................(2)From (1) and (2) , a = Mg / (M+m)∴ Reading of the machine = Reaction of weighing machine on the man = Mg - Ma = mMg / (M+m).
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