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Three equal weight A,B and C of mass 2kg...

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

A

`(a)zero`

B

`(b)13 N`

C

`(c)3.3 N`

D

`(d)19.6 N`

Text Solution

Verified by Experts

The correct Answer is:
B
`a = ("Net pulling force")/("Total mass")`
`= ((2 + 2 - 2) g)/(2 + 2 + 2) = (g)/(3)`
FBD of `C`
`mg - T = ma = (mg)/(3)`
:. `T = (2)/(3) mg`
`= (2)/(3) (20) = 13.3N`
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Knowledge Check

  • Two blocks of masses of 40 kg and 30 kg are connected by a weightless string passing over a frictionless pulley as shown in the figure.

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