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小 發表於 2010-4-18 11:18 PM (第 3233 天)
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2002Q12
STATE1:用conservation of momentum計
assume right direction be positive
0=50x-0.8+42xV
V=0.95
STATE2:no external force act on the system,so this is true
STATE3:when kitty catches the ball,she gain K.E.,so the statement is false
1994Q13好似out syllabus
MICROSCOPE係顯微鏡
1999Q11
STATE3:係橫向倒置
1996Q36
STATE1:應該connect PR.咁先可以令個bulb有10V ratio of turns:3600/180=20 200/20=10V
2002Q31
STATE3:as the ruler carries charges,that will induce charges on the running water,if the ruler carries positive charges,the negative charges on the running water will induce near the ruler ,and the induced positive charges will be repel on opposite side.so the statement is true
[ 本帖最後由 TwHiN 於 2010-4-18 11:35 PM 編輯 ]