香港寵物小精靈村落 論壇

標題: Physics [打印本頁]
作者: 抹茶可樂    時間: 19/1/2005 10:11 PM
標題: Physics
Three masses are set in the figure.
The table is horizontal and smooth.
The ropes are soft.

Find the acceleration of the system
and the tensions of the ropes.

[ Last edited by 落雷 on 2005-1-19 at 10:18 PM ]
作者: 細薯    時間: 20/1/2005 12:47 PM
i am now teaching this part wor~~~
let me think

now i can just remember:
1)F=ma
2)T=ma
3)W=mg
(F=net force,m=mass,a=accelaration,T=tension,W=weight,g=gravity)

[ Last edited by smallpotato226 on 2005-1-20 at 12:49 PM ]
作者: 細薯    時間: 20/1/2005 04:08 PM
i back home from school la~~

one of my teacher said:
g=10ms^-2

T1= the Tension of the rope of the right hand side
T2= the Tension of the rope of the left hand side

50-T1=5a ---------1
T1-T2=6a ---------2
T2-30=3a ---------3

1+2+3 ,20=14a

a=20/14=10/7

sub. into 1,
T1=50-5a=50-(50/7)=300/7

sub. into 3,
T2=3a+30=3(10/7)+30=240/7

[ Last edited by smallpotato226 on 2005-1-20 at 04:11 PM ]
作者: 抹茶可樂    時間: 20/1/2005 05:19 PM
thank you~~
原來係咁樣分開計…明了

其實我地連mech都未教
今日先教到evaporation=.=||||

[ Last edited by 落雷 on 2005-1-20 at 05:27 PM ]
作者: 細薯    時間: 20/1/2005 06:16 PM
Originally posted by 落雷 at 2005-1-20 05:19 PM:
thank you~~
原來係咁樣分開計…明了

其實我地連mech都未教
今日先教到evaporation=.=||||

[ Last edited by 落雷 on 2005-1-20 at 05:27 PM ]

你自習定?
作者: 抹茶可樂    時間: 20/1/2005 06:55 PM
Originally posted by smallpotato226 at 2005-1-20 06:16 PM:

你自習定?

那麼是當然…

今次Physics所有人死晒。(除左兩三個)
作者: 細薯    時間: 20/1/2005 08:03 PM
Originally posted by 落雷 at 2005-1-20 06:55 PM:

那麼是當然…

今次Physics所有人死晒。(除左兩三個)

你真勁.......
我連catch up D subject 都未得掂......
作者: 抹茶可樂    時間: 20/1/2005 08:45 PM
Originally posted by smallpotato226 at 2005-1-20 08:03 PM:

你真勁.......
我連catch up D subject 都未得掂......

那個exam係連我都死埋=="
作者: oscar    時間: 20/1/2005 10:11 PM
Originally posted by 落雷 at 2005-1-20 20:45:

那個exam係連我都死埋=="

你啲physics好廢？
作者: 抹茶可樂    時間: 20/1/2005 10:17 PM
Originally posted by oscar at 2005-1-20 10:11 PM:

你啲physics好廢？

係份卷的問題-,-



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