Determine tension in pulley problems, Physics

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Three equal weights A, B, C of mass 2 kg each are hanging on a string passing over a fixed frictionless pulley as shown. Tension in the string connecting weights B and C is approximately.

Answers: Acceleration of the system = a = (4-2)g/4+2

i.e. a=g/3

Tension in the string between B and C

T= apparent weight of C

= 2(g-a)

= 2(g-g/3)

= 13.07N

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