octopus001 發表於 9-9-2008 21:13:31

[AL] phy static

A bob of mass m is suspended from a fixed support by light string. A force F is applied to the bob so that the string makes angle with the vertical. What is the minimum value of F required to keep the bob in static equilibrium?








我計左好奈都係 F=Wtanx
但ans 係 mgsinx - -
help []

[ 本帖最後由 octopus001 於 9-9-2008 13:55 編輯 ]

piyopiyo 發表於 9-9-2008 21:54:07

mgsinx
咁樣會易睇d

octopus001 發表於 9-9-2008 21:57:47

點解要整斜佢GE?[]
睇到 -.-

[ 本帖最後由 octopus001 於 9-9-2008 13:59 編輯 ]

piyopiyo 發表於 9-9-2008 21:58:37

原帖由 octopus001 於 9-9-2008 21:57 發表 http://www.nakuz.com/bbs/images/common/back.gif
點解要整斜佢GE?[]
易睇d[]

octopus001 發表於 9-9-2008 22:00:25

我以為個f係horizontal - -

piyopiyo 發表於 9-9-2008 22:02:05

原帖由 octopus001 於 9-9-2008 22:00 發表 http://www.nakuz.com/bbs/images/common/back.gif
我以為個f係horizontal - -
...[]

咁唯有靠你自行汁生

octopus001 發表於 9-9-2008 22:03:56

我想問點解個f 個direction 係咁ge?

piyopiyo 發表於 9-9-2008 22:07:56

粒bob的vertical position上升左...

piyopiyo 發表於 9-9-2008 22:10:03

最清楚版[]

Zend 發表於 9-9-2008 22:22:40

留意下, 如果無力, 個acceleration方向
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