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Solution – Firing to the North Let s denote the required deviation. This deviation is caused by the Coriolis force macor, and thus- s 1 acor t 2 2 Where the time can be calculated using the direct data for the length and velocity of the flight- t = l/v. Therefore- s 1 l2 1 l2 l 2 sin 60o o a 2 v sin 60 cor 2 v2 2 v2 v see Fig.1. If we define the axis and as: since as in Fig. 1, then we can write the velocity vector of the river , we have that the coriolis correction to the acceleration vector is Now observe at Fig. 2. it shows a cross-section of the river, as it flows towards you. convince yourself that the new x' axis, which is pointing towards the left bank of the river, is the same as the previous x axis, so the river feels coriolis' acceleration also, it feels an acceleration downwards, we'll naturally call it g, which is comprised of the gravity acceleration and a small, insignificant, centrifugal correction. so we have and now we'll argue that