[AL] phy static

octopus001

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 [[yoyo_119]]

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

piyopiyo

mgsinx
咁樣會易睇d

octopus001

點解要整斜佢GE?[[yoyo_115]]
睇到 -.-

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

piyopiyo

原帖由 octopus001 於 9-9-2008 21:57 發表
點解要整斜佢GE?[[yoyo_115]]

易睇d[[tk_24]]

octopus001

我以為個f係horizontal - -

piyopiyo

原帖由 octopus001 於 9-9-2008 22:00 發表
我以為個f係horizontal - -

...[[tk_30]]

咁唯有靠你自行汁生

octopus001

我想問點解個f 個direction 係咁ge?

piyopiyo

粒bob的vertical position上升左...

piyopiyo

最清楚版[[tk_23]]

Zend

留意下, 如果無力, 個acceleration方向