Question

A copper pipe, used for plumbing from the water main to a house, is 4 meters long and has a circular cross-section 2.8 cm in diameter.

There is a 2 cm diameter hole in the center of the cross-section for the entire length of the rod. What is the volume of copper in the rod in cubic inches?

The density of copper is 559lb_m/ft^3 . What is the mass of the copper pipe in pounds?

what is the volume of copper in cubic inches?

Answer 1

the volume of the hose is equal to the difference of the areas of the inner and outer circles with area equal to pi d^2 / 4 multiplied by height of hose, 4 meters. The annulus area is equal to 3.02 cm2.The volume is equal to 0.0012 cub, m .mass is 0.0012 cub, m times density. answer is 0.67 ft3.