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A wooden block of mass 8 kg is tied to a...

A wooden block of mass 8 kg is tied to a string attached to the bottome of the tank. In the equilibrium the block is completely immersed in water. If relative density of wood is 0.8 and `g=10 ms^(-2)`, the tension T, in the string is

A

120 N

B

100 N

C

80 N

D

20 N

Text Solution

Verified by Experts

The correct Answer is:
D
Upthrust F=w+T

`T=F-w=V rho_(w)g-V rho_(b)g`
`=(rho_(w)-rho_(b))Vg`
`=(1000-800)((8)/(800))(10)=20 N`
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