感謝alan7872 ntust661等前輩為後學解惑 (後學的英文還要再加油) 後學完全學會了 感激不盡 後學有2題物理不懂 敬請大家多多指教 解釋越詳細越好 如果您認為答案有錯 也煩請不吝提出 謝謝 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? (大概是說 袋鼠想知道只靠一隻腳跳的話牠可以跳多高 假定儲存在腱裡的彈力位能和在範例6.12裡的一樣) 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. (大概是說 袋鼠伸展牠的腱的長度為X1時跳的高度是2公尺 請問袋鼠伸展牠的腱的長度為1.10*X1時 跳的高度是多少? 假定袋鼠跳的時候所需要的能量完全來自牠的腱 假定腱是個完美的彈簧 忽略空氣阻力和其他能量的消耗) A:2.4m 後學會範例第6.12題 但是後學完全不會第一題 > <" 敬請大家多多指教 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. (大概是說 一位運動員在高高的竿子上表演大回環 假定運動員在表演時一直保持他的手臂和身體直直的 假定運動員在他做大回環時沒有做功 請問他在最低點時的角速度是多少才能做出大回環的動作? 腳和竿子的距離是2公尺 運動員的腳和他的質心的距離為1公尺) A:5.4rad/s 對不起 翻譯的不好 敬請大家多多指教 解釋越詳細越好 謝謝 ^_^ --

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