Question

a metal pipe has a bore internal diameter of 5cm the pipe is 2 mm thick all around find the volume of 2 m long pipe if the one if 1 cm cube of the matter has a mass of 7.7 G

Answer 1

Answer:

Step-by-step explanation:

The inner diameter = 5cm

The inner radius = 5/2 = 2.5cm

The thickness = 5mm = 5/10 cm = 0.5cm

The outer radius = 2.5 + 0.5 = 3cm

The length of the pipe = 2m = 2x100cm = 200cm

Volume of the pipe = 22/7 x R² X h   22/7 x r² x h = 22/7 xh (R² - r²)

Where R= outer radius, r = inner radius and h = length of pipe

∴ Volume = 22/7 x 200 (3² - 2.5²)

               = 22/7 x 200 (9 - 6.25)

               = 1728.57 cm³

Mass = Density x Voulme

         = 7.7 x 1728.57

         = 13310g

1000g = 1kg

∴ the mass = 13310/1000 = 13.31 kg

Answer 2

Answer:

5.0336 kg

Step-by-step explanation:

Let r be internal radius and R the external radius of the metal pipe. Let h be its height .

Then, r=5/2 cm

Rest is given in above