ＰＨＹ ｍｃ答案

kkw

o, 明白了 第16題
淨番44條想你地清晰咁解番

好dill呀

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~

meow喵

22題用咩手-.-

REQUIEM

22題用咩手-.-
meow喵 發表於 20-4-2009 16:28

電動用左手
我考果陣都用左右手... 唉-.-

韓信

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....

REQUIEM

65# 韓信

第20題?

meow喵

re#64
係囉-.-
唔係左手咩
點解d人話右手

lkhj2525

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

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

cla981085

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

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.

josonshiu

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