Question

a cylindrical metal pipe has a external diameter of 6cm and internal diameter of 4cm.Calculate the volume of metal in a pipe of length 1m.If 1cm^3 of the metal has a mass of 8 g, find the mass of the pipe

Answer 1

Answer:

Step-by-step explanation:

6x-3=2x+9

6x-2x=9+3

4x=12

x=12/4

x=3

Answer 2

Final ans - 12.56

Step-by-step explanation:

SOLUTION :

Cross section area is π(6/2)² – π(4/2)² = 9π – 4π = 5π cm²  

Volume of 100 cm of pipe is 100(5π) = 500π cm³  

Weight is 500π cm³ • 8 g/cm³ = 4000π g = 4π kg = 12.56 kg