Question

Please solve q 180?

Answer 1

answer is (3)
i.e. 650 gm

Explanation:

Upthrust on ball = weight of displaced water
=`V sigmag=(m/rho)sigma g`
=`40/0.8*1*g`
=`50g` dyne or, `50gm`
As the ball is sunk into the water with a pin by applying downward force equal to upthrust on it.
So reading of weighing pan = weight of water + downward force against upthrust
= 600 + 50 = 650 gm