求助一英文题目

我要吃sumei

  A weight is attached to a spring and is suspended from a ceiling so that it lies 30 cm from the ceiling when it is at rest. The spring is stretched so that the weight is 38 cm from the ceiling and is then released. It bounces up and down for a while. Each time is comes to bottom of its bounce, the length of the stretch is 75% of the previous stretch.

a)  The period of each oscillation (bounce) of the weight is 1/2 second. Write an equation that represents the distance from the weight to the ceiling.

谢谢了~{03:}

fridman

一重物连接一弹簧挂在天花上，不受力时重物离天花30公分。把重物下拉到离天花38公分时再松手，重物弹上弹下，每次都走到最低点时的拉松量是前一次的0.75。a)重物弹到最高点到最低点时间为0.5秒，写出重物离天花距离的方程式。

我要吃sumei

fridman 发表于 2011-11-17 23:34
一重物连接一弹簧挂在天花上，不受力时重物离天花30公分。把重物下拉到离天花38公分时再松手，重物弹上弹下 ...

看来你还是懂英文挺多的嘛~~  哈哈哈

fridman

你猜下司令箱是什么东西？

fridman

不明白为什么后面还看到那2题挂在哪里？一道是自行车的速度问题，一道是这题