查看完整版本 : Vertical kinetic energy

雲艾法比 2013-5-6 09:16 PM

Vertical kinetic energy

有條Physics MC,寫:In each rebound,30% of the vertical kinetic energy was lost.
Energy呢個scalar用vertical去講好似好怪,以下兩個邊個先係正確解讀?

1. If given 一個斜既velocity and no change in horizontal KE,"30% of vertical KE lost" means 30% of the whole KE was lost.

2. If given 一個斜既velocity and no change in horizontal KE,"30% of vertical KE lost" means (1/2 m vsin theta二次)要multiplied by 0.7,即v sin theta係multiplied by 開方0.7,即係whole KE lost不=30%

[[i] 本帖最後由 雲艾法比 於 2013-5-6 09:28 PM 編輯 [/i]]

dustbus 2013-5-6 09:23 PM

我十年前問左喱條,你搵番個post吧:smile_30: :smile_30:

雲艾法比 2013-5-6 09:44 PM

[quote]原帖由 [i]dustbus[/i] 於 2013-5-6 21:23 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=360666510&ptid=21868799][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
我十年前問左喱條,你搵番個post吧:smile_30: :smile_30: [/quote][url=http://www.discuss.com.hk/search.php?searchid=3979&orderby=lastpost&ascdesc=desc&searchsubmit=yes]http://www.discuss.com.hk/search.php?searchid=3979&orderby=lastpost&ascdesc=desc&searchsubmit=yes[/url]
苦苦追尋都一無所獲:')

Zzlaz 2013-5-6 11:36 PM

simple maths:smile_39:



[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img][/url]
頁: [1]
查看完整版本: Vertical kinetic energy