Question

A ball of mass 17.10 kg and diameter 38.13 metre is held fully underwater ( density 1000 kg/m^ 3) Calculate:

a) the upthrust on the ball

b) the density of the ball

c) the percentage of the ball above the surface of the water if it is allowed to float

Answer 1

(A)

upthrust will be equals to it’s weight

which is 17.10kg

(B)

density will be;

$d=m/v=17.10/38.13=0.448$ kg/m

(C)

There will be 100% chances to hit the ball on surface because it is coming back with the same upthrust force as it’s weight so there will be no hindrance.