First slide

Fluid statics

Question

A fisherman hooks an old log of wood of weight 12 N and volume I000 cm³ . He pulls the log half way out of water. The tension in the string at this instant-is:-

Easy

A

12 N
B

8 N
C

10 N
D

7 N

Solution

$T = mg - V ρ g = 12 - (\frac{1000}{2} \times 10^{- 6} \times 10^{3} \times 10) = 7 N$

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