5. The torque, T newton metres, required to rotate shafts of different diameters, D millimetres, on a machine is shown below. If the law is T = aD", where a and n are constants, draw a suitable graph and hence determine the values of a and n. D T 7.0 0.974 10 1-71 18 4.33 25 7.28 40 15-3

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