感谢alan7872 ntust661等前辈为後学解惑 (後学的英文还要再加油) 後学完全学会了 感激不尽 後学有2题物理不懂 敬请大家多多指教 解释越详细越好 如果您认为答案有错 也烦请不吝提出 谢谢 1. A kangaroo decides to see how high it can hop on one leg. Assuming the elastic energy stored in the tendon is the same as for Example 6.12, how high can it jump using a single leg? (大概是说 袋鼠想知道只靠一只脚跳的话牠可以跳多高 假定储存在腱里的弹力位能和在范例6.12里的一样) A:0.35m Example 6.12 Suppose the height h of a kangaroo's hop after it stretches its tendons a distance X1 (beyond their unstretched length) is 2.0m. How high would the hop be after it stretched the tendons 10% more than after (that is, a distance 1.10*X1 beyond their unstretched length)? In a simplified model, we assume that all energy for a kangaroo's hop comes from the elastic energy stored in the tendons, which behave as ideal springs. Ignore air resistence and other energy dissipation. (大概是说 袋鼠伸展牠的腱的长度为X1时跳的高度是2公尺 请问袋鼠伸展牠的腱的长度为1.10*X1时 跳的高度是多少? 假定袋鼠跳的时候所需要的能量完全来自牠的腱 假定腱是个完美的弹簧 忽略空气阻力和其他能量的消耗) A:2.4m 後学会范例第6.12题 但是後学完全不会第一题 > <" 敬请大家多多指教 2. A gymnast is performing a giant swing on the high bar. In a simplified model of the giant swing, assume that the gymnast keeps his arms and body straight as he swings all the way around the upper bar. Assume also that the gymnast does no work during the swing. With what angular speed should be moving at the bottom of the giant swing in order to make it all the way around? The distance from the bar to his feet is 2.0m and his center of gravity is 1.0m from his feet. (大概是说 一位运动员在高高的竿子上表演大回环 假定运动员在表演时一直保持他的手臂和身体直直的 假定运动员在他做大回环时没有做功 请问他在最低点时的角速度是多少才能做出大回环的动作? 脚和竿子的距离是2公尺 运动员的脚和他的质心的距离为1公尺) A:5.4rad/s 对不起 翻译的不好 敬请大家多多指教 解释越详细越好 谢谢 ^_^ --

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