Created by StemPy LabA steady wind blows over a calm sea. Ship P sails due north at , and the flag on its mast streams out towards the north-east. Ship Q sails due east at , and its flag streams out due north. (A flag streams out along the wind as it is felt on the ship, that is, along the wind's velocity relative to the ship.) Which of the following statements are correct?
One or more options are correct. Tick all the correct ones: a wrong option costs marks, and a part-right answer earns part of the marks.
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← Two cars go round a large, flat roundabout, both anticlockwise, on circular lanes with the same centre O. Car A is on the inner lane, of radius 30 m, at a steady 15 m/s. Car B is on the outer lane, of radius 40 m, at a steady 20 m/s. At one instant O, A and B lie on one straight line, with A between O and B, as shown in the figure. At that instant, what is the acceleration of B relative to A (as measured by an observer who moves with A but does not turn)?A racing car goes round a flat circular track of radius 100 m, speeding up. The driver controls the throttle so that the car's total acceleration always makes an angle of 60° with its velocity. How far along the track does the car travel while its speed rises from 10 m/s to 20 m/s? →
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