Question

A fisherman hooks an old log of wood of weight 12N and volume 1000 $c{m}^3$. He pulls the log half way out of water. The tension in the string at this instant is

• A. 12 N
• B. 8 N
• C. 8 N
• D. 7 N

Answer 1

The correct option is D

7 N

T = Mg - $\left(\frac{V}{2}\right)$ d'g

$T=12-(500\times {10}^{-6})\left({10}^3\right)\left(10\right)$
$=12-5=7N$