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A lift of mass 2000 kg is supported by thick steel ropes. If maximum upward acceleration of the lift be 1.2 ms–2, and the breaking stress for the ropes be 2.8 × 108 Nm–2, what should be the minimum diameter of rope?
An aeroplane flying in the sky dives with a speed of 360 kmh–1 in a vertical circle of radius 200m. The weight of the pilot sitting in it is 75 kg. Calculate the force with which the pilot presses his seat when the aeroplane is
(i) at the highest position and
(ii) at the lowest position of the circle. Take g = 10 ms–2