Question

The length of metal pipe is 70cm, diameter of inside is 10cm and thickness of metal is 5mm. If density of metal is 8gm/cm^3 than find mass of metal

i ask 13times​

Answer 1

Here's your answer.

Hope it makes your doubt clear.
By the way I have used the formula of circular ring and multiplied it with the length of pipe to get the vol. of the pipe

Answer 2

when you plus inner radius with thickness after converting diameter into radius and mm into cm by multiple by 10. then you will get outer radius. now you find out volume of cylinder 2pie r +2pie rh. and multiple it with 8gm you can got your answer. sorry I'm not able to solve it because it's so lengthy