Physics

抹茶可樂

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 ]

細薯

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 ]

細薯

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 ]

抹茶可樂

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 ]

細薯

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?

抹茶可樂

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)

細薯

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......

抹茶可樂

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=="

oscar

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？

抹茶可樂

Originally posted by oscar at 2005-1-20 10:11 PM:

你啲physics好廢？

係份卷的問題-,-