Question

the thickness of a metallic tube is 1 cm and its outer radius is 11 cm find the mass of such a one metre long tube if the density of the metal is 7.5g​

Answer 1

Answer:

Explanation:

As we all know density=mass/volume

so density= 7.5 g

volume of the tube is volume of outer radius -volume of inner radius=volume of the metallic tube

volume of outer radius=π×r^2×h

                                       =π×(11×10^-2)^2×1

                                       =0.038m^3

volume of inner radius=3.14×10^-4

volume of tube=0.038-3.14×10^-4

                         =0.0376 m^3

now,

      mass=(7.5×10^-3)×(0.0376)

               =2.8×10^-4 kg

               =0.28 g