Three blocks A, B and C of mass m each are arranged in pulley mass system as shown. Coefficient of friction between block A and horizontal surface is equal to 0.5 and a force P acts on 'A' in the direction shown. The value of P/mg so that block 'C' doesn't move is –
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(5)
Sol. If C doesn’t move then a A = 4a B … (i)
P – T – µmg = m 4a B …(ii)
4T – mg = ma B …(iii)
= 5
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