o, 明白了 第16題
淨番44條想你地清晰咁解番
本帖最後由 好dill呀 於 20-4-2009 16:50 編輯
44.
變壓器只可能把交流電升壓同降壓 , e個都係用交流電輸電ge原因
因為電池是直流電,所以變壓器唔可以降低電壓~
22題用咩手-.-
22題用咩手-.-
meow喵 發表於 20-4-2009 16:28 http://www.nakuz.com/bbs/images/common/back.gif
電動用左手
我考果陣都用左右手... 唉-.-
22用FLEMING'S RIGHT HAND RULE(INDUCED CURRENT)
33
1--->一齊放入雪櫃一定係同TEMP
2--->TEMP IS A MEASURE OF AVERAGE K.E 所以1岩2都岩
3--->POTENTIAL ENERGY係DEPENDS ON STATE AND MASS
MASS大INTERMOLECULAR FORCE相對大
所以3錯
仲有冇人有野問....
65# 韓信
第20題?
re#64
係囉-.-
唔係左手咩
點解d人話右手
本帖最後由 lkhj2525 於 20-4-2009 09:31 編輯
但係S斷開，電流只係用最外面條電路流動，第二個電阻果條路都唔經過，點形成並聯？
┌─────電池───────────┐
│ │
└─電阻Ａ─┬──電阻Ｂ──開關按鈕 ...
Rebellion.KLC 發表於 20-4-2009 06:31 http://www.nakuz.com/bbs/images/common/back.gif
唔無意思我記錯中文名=.=
揀c既就話有p.d.
揀a就話度唔到
唔知邊樣岩
本帖最後由 cla981085 於 20-4-2009 17:32 編輯
22用FLEMING'S RIGHT HAND RULE(INDUCED CURRENT)
33
1--->一齊放入雪櫃一定係同TEMP
2--->TEMP IS A MEASURE OF AVERAGE K.E 所以1岩2都岩
3--->OTENTIAL ENERGY係DEPENDS ON STATE AND MASS
MASS大INTERMO ...
韓信 發表於 20-4-2009 16:44 http://www4.nakuz.com/bbs/images/common/back.gif
for 22
A current carrying wire, perpendicular to the plane of the paper, is located at P. P is in the midway between two identical bar magnets with unknow polarities X and Y as shown in the figure. The current in the wire is flowing into the paper. The magnetic force F acting on the wire is downward. Which of the following statements are correct?
所以應該用left hand.
本帖最後由 josonshiu 於 20-4-2009 17:41 編輯
我比左我啊哥做 佢9成9岩晒 我諗我得25分= =""
不過我都係唔打AWS 未徵求過佢同意 對唔住 各位
41條係A!!
第6條無可能係C
CONSTANT force ---->CONSTANT acceleration ---->v 會直線斜上去
因為P=Fv
CONSTANT force ,只考慮v 當v直線斜上去 P都會 so答案係B
上面提供的mc答案都有d錯 不過都多岩既.... 多謝分享