To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. She finds that the specimen weighs twice as much in air as it does in water. The density of the solid part of the specimen is 5.0×103kg/m35.0×10
3
kg/m
3
. What fraction of the specimen's apparent volume is solid?

Fraction of the specimen's is 0.4.

Explanation:

We know,

Mass = volume × density

Weigh= mass × g

          = volume × density× g

          = density× g × volume

An object weighs less submerged due to buoyant force acting on it.

Given that, the weighs of the specimen in dry is twice of the weighs in air.

Then ,

Therefore,

                     =0.4

Fraction of the specimen's is 0.4.

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.