Question

PIoblemSet3/1/ MAA MATHEMATICAL ASSOCIATION OF AMERICA Logge webwork /engr1201-common / problemset3/1 ProblemSet3: Problem 1 Previous Problem List Next Results for this submission Entered Answer Preview 59.81 59.81 19.30 19.30 At least one of the answers above is NOT correct the water main to a house, is 6 meters long and has a (20 points) A copper pipe, circular cross-section 3 cm in diameter. There is a 2.2 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? used for plumbing from in3 The density of copper is 559 1bm/ ft. What is the mass of the copper pipe in pounds? 19.3 lbs Note: You can earn partial credit on this problem Submit Answers Preview My Answers Your score was recorded You have attempted this problem 12 times You received a score of 0% for this attempt. Your overall recorded score is 50%

Answer 1

cross section of the pipe = 3cm = 1.18 in dia

radius = 0.59 in

hole in the cross section = 2.2 cm = 0.866 in dia

radius = 0.433 in

area of the cross section = $\pi$(0.59² -0.433²) = 0.505 sq.in

length of the pipe = 6 m = 236.22 in

volume of the copper = 232.22 *0.505 = 119.29 cu.in

density of copper = 559 lbm/cu.ft = 0.323 lbm/cu.in

mass of copper = 0.323* 119.29 = 38.59 lbm