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Question

The tension T in the string in figure is

  1. (31)50 N
  2. Zero
  3. 50 N
  4. 353 N


Solution

The correct option is B Zero
Friction force is trying to uppose the motion so,
fs=μmgcos300=0.7×10×10×32
fs=353=60.62 N
Gravitational force helping in motion i.e,
F=mgsin300=10×10×12=50 N
Since fs>F, this means friction force is sufficient to oppose gravitational force. So, tension will be Zero
 

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