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## Main Question or Discussion Point

1-A hollow ball is suspended in water,has a larger density than the density of the water..how?

Fb=Fg (okay)

ρ(of water)* (Vol of ball substance+Vol.of the cavity)=ρ(of the ball) * vol of the ball substance)

(not okay)

I don't understand how we calculate the buoyant force

The buoyant force should be calculated according to the equation: Fb=ρ(of water)*Vol of the substance*g

not Fb=ρ(of water)* (Vol of ball substance+Vol.of the cavity)*g

2-when a body is suspended in water,does the level of water rise up when we try to move this body to the bottom?and does the buoyant force increases as we go down?

Thanks in advance..

Fb=Fg (okay)

ρ(of water)* (Vol of ball substance+Vol.of the cavity)=ρ(of the ball) * vol of the ball substance)

(not okay)

I don't understand how we calculate the buoyant force

The buoyant force should be calculated according to the equation: Fb=ρ(of water)*Vol of the substance*g

not Fb=ρ(of water)* (Vol of ball substance+Vol.of the cavity)*g

2-when a body is suspended in water,does the level of water rise up when we try to move this body to the bottom?and does the buoyant force increases as we go down?

Thanks in advance..