1. Three equal weights A, B and Cof mass 2 kg each are hanging on a st

1.	1. Three equal weights A, B and Cof mass 2 kg each are hanging on a string passing overa fixed frictionless pulley as shown in the figure. The tension in the string connectingweights B and Cis approximately(a) zero13 N(c) 3.3 NABI(d) 19.6 N
Answer» Let the required tension be T and the tension in the string connecting A and B be T1 equations are: for C = 2 g - T = 2 a (i) for B = 2 g + T - T1= 2 a (ii) and T1- 2 g = 2 a (iii) adding (i), (ii), (iii) 2 g = 6 a or a = g/3 substituting in (i) = T = 2(g -a) = 2(g - g/3) = 4 g/3 = 4(9.81)/3 = 13.08 N

1. Three equal weights A, B and Cof mass 2 kg each are hanging on a string passing overa fixed frictionless pulley as shown in the figure. The tension in the string connectingweights B and Cis approximately(a) zero13 N(c) 3.3 NABI(d) 19.6 N

Answer»

Let the required tension be T and the tension in the string connecting A and B be T1

equations are:

for C = 2 g - T = 2 a (i)

for B = 2 g + T - T1= 2 a (ii)

and T1- 2 g = 2 a (iii)

adding (i), (ii), (iii)

2 g = 6 a or a = g/3

substituting in (i) = T = 2(g -a) = 2(g - g/3) = 4 g/3

= 4(9.81)/3 = 13.08 N

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1. Three equal weights A, B and Cof mass 2 kg each are hanging on a string passing overa fixed frictionless pulley as shown in the figure. The tension in the string connectingweights B and Cis approximately(a) zero13 N(c) 3.3 NABI(d) 19.6 N

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