Answer: Upon spotting an insect on a twig overhanging

Chapter , Problem 41

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Upon spotting an insect on a twig overhanging water, an archer fish squirts water drops at the insect to knock it into the water (Fig. 4-38). Although the insect is located along a straight-line path at angle \(\phi\) and distance d, a drop must be launched at a different angle \(\theta_{0}\) if its parabolic path is to intersect the insect. If \(\phi=36.0^{\circ}\) and d = 0.900 m, what launch angle \(\theta_{0}\) is required for the drop to be at the top of the parabolic path when it reaches the insect?