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Q5. The torque, T newton metres, required to rotate shafts of different diameters, D millimetres, on a machine is shown in Table Q5.

(a) Verify graphically that T and D are related according to the law: (10)

T = a Dⁿ where a and n are constants.

Suggested scales:      horizontal axis 2 cm = 0.1

vertical axis 2 cm = 0.1

(b) Using the graph drawn in Q5(a), determine approximate values for a and n. (6)