Physics circular motion
本帖最後由 screen 於 12-2-2010 15:12 編輯想問下呢條MC
我唔明第一點解岩
我計到 tanθ= mrω^2/mg=rω^2/g
咁θ算唔算independent of ω?
求高手指教:handshake
http://b.imagehost.org/0960/Image019.jpg
相中鉛筆寫既字請無視 F=mrω2
Tsinθ= m(Lsinθ)ω
T=mω2L
所以係independant
我諗係咁.. 唔算
θ is dependent of ω
你自己條式都proof到
唔信自己做個實驗就知 F=mrω
Tsinθ= m(Lsinθ)ω
T=mωL
所以係independant
我諗係咁..
L.K. 發表於 12-2-2010 22:43 http://www.nakuz.com/bbs/images/common/back.gif
但係T=mgcosθ啵...
唔算
θ is dependent of ω
你自己條式都proof到
唔信自己做個實驗就知
aildux 發表於 13-2-2010 16:21 http://www.nakuz.com/bbs/images/common/back.gif
即係depend?
但係本野答案寫C
其實depend係咪指direct proportional? 唔係Tcosθ=mg咩...
======================
T=W
=========================
T=mωL
ωincrease
Ldecrease
T 係constant
除非你改左個W
=================
Tcosθ=mg
Wcosθ=mg
cosθ=mg/W
============
我諗係咁.. 唔係Tcosθ=mg咩...
======================
T=W
=========================
T=mωL
ωincrease
Ldecrease
...
L.K. 發表於 18-2-2010 02:55 http://www.nakuz.com/bbs/images/common/back.gif
Tcosθ=mg 你岩 係我搞錯左
但係我計到tanθ=rω^2/g 始終都係有一個關係-_-
咁可以當佢independent咩-_- 你都唔理r,w受乜影響 你都唔理r,w受乜影響
永樂 發表於 20-2-2010 18:11 http://www.nakuz.com/bbs/images/common/back.gif
唔係好明白你講咩-_- V=IR
如果R increase
個V會唔會大左? V=IR
如果R increase
個V會唔會大左?
L.K. 發表於 24-2-2010 19:35 http://www.nakuz.com/bbs/images/common/back.gif
會?-.-
頁:
[1]
2