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Find mass of a cylindrical iron pipe 2.1m long and 12cm in external diameter, if the metal is 1cm thick and of density 7.8g/cm (take she as 22/7)

v = π(12^2 - 11^2)*210 cm^3

mass = density * volume

and that's "pi" not "she" !!

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Did you know?

Did you know that the mass of a cylindrical iron pipe can be calculated using its dimensions and the density of the metal? In this case, we have a pipe that is 2.1m long with an external diameter of 12cm. However, to find the mass, we need to consider that the metal is 1cm thick. To calculate the mass, we can first find the volume of the iron pipe by subtracting the inner cylinder (empty space) from the outer cylinder. Using the formula for the volume of a cylinder, we can calculate the volumes of both the outer and inner cylinders. Next, by subtracting the volume of the inner cylinder from the volume of the outer cylinder, we find the volume of the iron in the pipe. Multiply the volume by the density of iron, which is 7.8g/cm³, to obtain the mass in grams. Remember to use the value of "pi" as 22/7 when performing the calculations. By applying these steps, we can determine the mass of the cylindrical iron pipe accurately.