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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. 100NB. 80NC. 50ND. 20N

Answer» Correct Answer - 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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