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A hollow metal pipe whose external and internal diameters are 6.3cm and 2.8cm respectively is 3.5m long.
a) Calculate the volume of the metal used to make the pipe.
b) The pipe is melted down and recast into a solid cylinder of height 1.75m. Calculate the radius of the cylinder to two decimal places.
c) Given that the density of the metal above is 4.2g/#cm^3#, calculate the mass of the solid cylinder in kilograms.