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Q.

Three equal weights A, B and C of mass 3 kg each are hanging on a string passing over a fixed pulley which is frictionless as shown in figure. The tension in the string connecting B and C is?

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a

Zero

b

13 N

c

3.3 N

d

19.6 N

answer is D.

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Detailed Solution

acceleration of system a=Net pulling forceTotal mass =6g−3g9=g3For C the equation of motion ismCg−TBC=mCaTBC=mCg−a =39.8−9.83 = 19.6 N

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Three equal weights A, B and C of mass 3 kg each are hanging on a string passing over a fixed pulley which is frictionless as shown in figure. The tension in the string connecting B and C is?