If you point a cannon, aim an arrow or throw a basketball, the trajectory that gets you furthest will be at 45 degrees to the vertical. So the same must be true for Tarzan on a rope swing. He ought to let go when the rope is at 45 degrees to the vertical, right? Not so, says Hiroyuki Shima at the University of Yamanashi in Japan, who today takes us through some straightforward calculations to show the answer is not quite as intuitive as you might imagine. Shima begins by defining the question as in the diagram above.
To release one's grip on someone or something. Please let go of me—you're hurting my arm! The child let go of the string, and the balloon floated up and away into the sky. To fire or dismiss an employee.
Once there lived a village of creatures along the bottom of a great crystal river. The current of the river swept silently over them all - young and old, rich and poor, good and evil, the current going its own way, knowing only its own crystal self. Each creature in its own manner clung tightly to the twigs and rocks at the river bottom, for clinging was their way of life, and resisting the current what each had learned from birth. But one creature said at last, 'I am tired of clinging.