Physics Homework Help?

Question

The specific gravity of an object is 0.867, whereas that of seawater is 1.025.

What percent of an object is above the surface of the water?

Answer 1

Step 1:

Specific gravity of an object is the ratio of density of sample to density of  reference substance.

Specific gravity of an object is .

Specific gravity of an seawater is .

Let the mass of the object as and volume of the object as .

Gravitational force on the object is .

Step 2:

Let  volume of seawater submerged as .

By Archimedes Principle, the buoyance force .

At the equilibrium: .

Immersed portion of the volume into the water is 0.845.

Hence, the percentage of object under the sea water is 84.5.

Therefore, the percentage of object above the sea water is .

Percentage of object above the sea water is 15.5.

Solution:

Percentage of object above the sea water is 15.5.