help on 5 a solid iron cannon ball with mass of 20kg and rubber kickball with ma

Question

help on 5
a solid iron cannon ball with mass of 20kg and rubber kickball with mass of 750g have exactly the same size and shape. when completely submerged in a tank filled with water and released the Cannon ball begins to sink to the bottom of the tank and the kickball begins to rise to the surface of the tank. when both objects are completely submerged in the fluid the boy any force exerted by the fluid
a. is the same for both objects
b. is different for both objects however the greater buoyant force cannot be determined without more information
c. is greater on the kickball because it has lower density
d. is greater on the kickball because it rises to the surface
e. is greater on the cannon ball because it has greater density.

Explanation / Answer

The Buoyancy force is the weight of liquid displaced. As the volume of both the balls are equal, volume displaced of liquid and hence weight is equal. So same buoyancy acts on both the bodies.

Since kickball weight is less than buoyancy, net force is upwards so it moves up

For iron ball weight is greater than buoyancy, net force is downwards so it moves down

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