Question

Why is it easier to swim in the ocean than in the river? Explain using the buoyancy force concept.

A basketball floats on water in a bathtub. The ball has a mass of 0.5 kg and a diameter of 22 cm.

a) What is the buoyant force?

b) What is the volume of water displaced by the ball?

c) What is the average density of the basketball?

Answer 1

Here ,

it is easier to swin in ocean as the density of seawater is more than the density of river water.

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a) Buoyant force = m * g

Buoyant force = 0.50 * 9.8

Buoyant force = 4.9 N

b)

volume of water displaced = volume of 500 gm water

volume of water displaced = 500 cm^3

volume of water displaced = 5 *10^-4 m^3

c)

avearge density of baseball = mass/volume

avearge density of baseball = 500/(4pi/3 * 11^3)

avearge density of baseball = 0.0896 gm/cm^3

avearge density of baseball = 89.6 Kg/m^3