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[問題] phy 求解答~

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phy 求解答~

1) A ship B is steaming on a straight course south-east at a uniform speed of 15km/h. Another ship A, is a distance of 10km due north of B and steams at a speed of 12km/h. Find the course that A must steer in order to get as close to B as possible, and their minimum distance apart.

2)a light inextensible string fastened to a point in the ceiling passes under a smooth movable pulley of mass 5 kg, over a smooth fixed pulley and carries a 4 kg mass hanging freely. If the system is released from rest, find the rising speed acquired by the movable pulley in 2 seconds.

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