??????????~~

???? · 发表于 2006-10-30 16:11:00

???????????????��??????????0.2????????40m/s???????????????????????????????1cm?��

chinalaohu · 发表于 2006-10-30 16:32:00

?????,???????,?????????????
??????(??),??????(??),?????????

wdnight · 发表于 2006-10-30 17:59:00

?????????

????????????G?9.8???1.8???30

??????????????45M/S

?GOOLGE???????????????8g???????75m/s????????????????????

???????????????????????

zakarum · 发表于 2006-10-30 18:27:00

???
???????????????
????F=(1/2)C?SV^2
???C???????????????S???????V?????????????
??C?????????????????????�????�???????????????
????Cw??????????????????????????????Cw????0?3(?)�0?6(?)??????????(???????)??????????????????????Cw?????????????????????Cw????

??????????????C??????0.3?
?????????????????????????????????????????????????????????????????300??3000????-_.-!????????????��

??0.2s??????????????????????????????????????0.2s?????????4m???????????��
??????????????????????????????????0.01m????????????40m/s????0.01m??0??????????-80000m/s^2????????0.0005s
???????????????????????????????????????????????????????????????????0.01m?????????????-40000m/s^2????????0.001s
????400N???=400/0.00062=6.45×10^5Pa???5?????
????????????
???????��??????? [em22]

chinalaohu · 发表于 2006-10-30 20:00:00

??????????,
???????,???????.
?????????.??,???!

Cipher · 发表于 2006-10-30 20:02:00

?????????????????????????????40m/s
???????
E=1/2*mv^2=0.5*0.01*1600=8??

????????BB????????????2?
???????20????????
Beretta 92FS???????M9?????445??

???????????????????????????????????????????????????????????????????????????

???????????????AUG???????????????????????????????????????????????????????????????????56???????????????????????????

lwevil · 发表于 2006-10-30 21:45:00

???? ???????? ??

??????? · 发表于 2006-10-30 22:00:00

99%????
1%o ???

?? · 发表于 2006-10-30 23:24:00

????.
?????,
30????????????,??????????,??????.
????30??2????????.

zakarum · 发表于 2006-10-31 10:27:00

??????F=(1/2)C?SV^2
�????????,??????�????????=????
??F=mg=0.098N
??????=1.295kg/m^3
????S=2?R^2=0.00123m^2
�Cw????0?3(?)�0?6(?)??????????(???????)??????????????????????Cw?????????????????????Cw???�
?????????C?????0.3?????0.35??
?????????
V=(2F/C?S)^0.5=??18.7m/s???????????????????????????
??????24m???????????????8??9??????????30??????????22???????????????2.8m???
??????????????????8?????????????
?????????2??????20m/s???````?????�� [em22]

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