Question

A cylindrical drain pipe has internal and external diameters of 6.4cm and 7.6cm respectively. Calculate the mass of the pipe per meter if it is made of metalof density 8g/cm^3

Answer 1

Answer:

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)

Step-by-step explanation:

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)