Question

USING 54 POINTS PLEASE HELP!  What is the volume of the metal in this heavy-duty pipe? (It is not drawn to scale and the inside of the pipe is empty space.) Show all work and be sure to label your answer. Use 3.14 to estimate pi.

Answer 1

Volume = PI x radius² x length
External volume: 3.14 x 3² x 100 = 2826 cm³
Internal volume: 3.14 x 2² x 100 = 1256 cm³
Volume = 2826 - 1256 = 1570 cm³
Density = 0.009 kg/cm³ (slightly more dense than copper)
Mass = volume x density = 1570 x 0.009 = 14.13 kg (14.14 if you use a proper PI