Answer:
Option B. 0.783 pounds
Step-by-step explanation:
step 1
Find the area of a a 36 inch piece of PVC pipe with an outside diameter of 0.82 inches and an inside diameter of 0.75 inches
The area of a circle is equal to
[tex]A=\pi r^{2}[/tex]
we have
[tex]r2=0.82\ in[/tex]
[tex]r1=0.75\ in[/tex]
assume
[tex]\pi =3.14[/tex]
[tex]A=\pi (r2^2-r1^2)[/tex]
substitute the values
[tex]A=(3.14)(0.82^2-0.75^2)[/tex]
[tex]A=0.345086\ in^2[/tex]
step 2
Find the volume of the piece of PVC
Multiply the area by its length
[tex]V=0.345086(36)=12.42\ in^3[/tex]
step 3
Find the weight of the piece of PVC
Multiply the volume by its density
The density is [tex]0.063\frac{lb}{in^3}[/tex]
so
[tex]W=12.42(0.063)=0.783\ lb[/tex]
