Answer:
Part a) The volume of the air is
Part b) The volume of the plastic is
Step-by-step explanation:
we know that
The volume of the sphere is equal to
step 1
Find the volume of the complete ball (air +plastic)
we have
------> the radius is half the diameter
substitute
step 2
Find the volume of the air
we have that
The plastic is 2 mm thick
Convert to cm
2 mm=2/10=0.2 cm
so
The radius of the interior of the ball is
substitute
-----> this is the volume of the air (interior of the ball)
step 3
Find the volume of the plastic
we know that
The volume of the plastic is equal to the volume of the complete ball minus the volume of the air
so