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

A wooden block of mass 8kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. Relative density of wood is 0.8. Taking g=`10m//s^(2)`, What is the tension in the string ?

A

100N

B

80N

C

50N

D

20N

Text Solution

Verified by Experts

The correct Answer is:
D
Volume of block `=(8)/(0.8xx10^(3))=10^(-2) m^(3)`
U= upthrust = weight of water displaced `=10^(-2) xx 10^(-3) xx 10 =100 N`
w = weight =80 N
`T_("ension") =U - w = 100 N - 80N =20 N`
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