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Two masses A and B of mass 15kg and 6kg ...

Two masses `A` and `B` of mass `15kg` and `6kg` are connected by a string passing over a friction pulley fixed at the corner of a table as shown in The coefficient of friction between `A` and table is `0.3` the minimum mass (in kg) of that must be placed on `A` to prevent it from moving is
.

Text Solution

Verified by Experts

The correct Answer is:
`5`
Here, mass of `A =15kg` mass of `B =6kg`
mass of `C = m kg= ?`
To prevent the motion weight of B = force of friction between table and blocks `A` and `C`
`6 g = mu (R) g = 0.3 (15 + m)g`
`15 + m = (6)/(0.3) = 20`
`m = 20 - 15 =5 kg` .
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