Answer :

(a) When the ship's stationary, the speed of the ship is equal to earth's rotation. So it’s speed is .


(b) The tension in the string at the equator is given by



Where, is the earth's attraction on the bob. The difference between T0 and the earth’s attraction on the bob is



(c) The angular speed of the ship is v/R about its center. This is in the opposite direction to the earth's rotation. Hence total angular speed,


Now, tension is given by ,





From(b)



Now, is a very small quantity, hence



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