Question

the outer and inner diameter of a metallic cylindrical pipe are 16cm and 14 cm respectively , it's length is 42 cm and density of the metal used in 5gm per cubic centimetre . Find the mass of the metal used , in kilograms​

Answer 1

Answer:

39.6 Kg

Step-by-step explanation:

DENSITY= MASS/VOLUME

volume of hollow cylinder = π(R^2 - r^2)h

=22/7 x (256 - 196) x 42

=22 x 60 x 6

= 22 x 360

= 7920 cm^3

mass = density x volume

= 7920 x 5

= 39,600 g

= 39.6 Kg