First slide
Equation along the string with friction
Question

In the arrangement shown, each of the blocks A and B has mass ‘m’ coefficient of friction between block B and table top is 0.5. The pulley is light then magnitude of reaction at the spindle of the pulley is _____

Moderate
Solution

Acceleration,  a=mg0.5×mg2m=g/4tension string,     T=mgm  ×  g4  =  3mg4Reaction at spindle=T2+T2=3mg22

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