真子彈fly快d或是bb彈快d?

一定係真子彈快.

根據動能公式
E=0.5MxV^2
即係要去到音速(330m/s)就要10.89J.
而9mm x 19子彈既初速就係同音速相若,約305m/s~370m/s.
手槍既9mm已經算慢
如果你用步槍彈去比差距仲大

2009-01-30 17:12:31 補充：
BB彈槍係冇可能去到10J.

更何況香港只畀你玩2J.
所以一定係真子彈快

我覺得子彈快o的
because 子彈系又爆炸力而爆發出黎
bb彈系就系輕o的 但系都比唔上子彈啦- -
個人意見

OMG,
bb is travel by the gas pressure, the real bullet is travel by the force of gun powder. it is no compare about their weight or mess.
bb ball ball average speed is between 650 - 900 fps, some may up to 1100 fps by co2 gas.
9mm speed is 1100 - 1700 fps with @300 lbs/ft force at 100 meters.
.45acp is little slower, 900 - 1500 fps, but it carry @500 lbs/ft force.
in day like, i still can see the bb shoot out into targer, but i never see the real bullet travel through the distant into targer. too fast.

2009-01-26 08:01:51 補充：
bb is .9 fire from co2,the speed is top up to 1100 fps.

.227 from M-16 is 3841fps.

do the math again la

2009-01-26 08:05:38 補充：
another example,
i let you shot me ( 3 ) bb from 100 ft. away,
then let me shot you a .22 in the same distant.
do you think it is fair?

應該bb快d
但系速度維持應該系真子彈好d

物理個條 k.e 式知唔知
K.E.=0.5mv^2

如果假設兩種子彈的energy 是一樣 (e.g 100)
真子彈mass =0.5kg
bb子彈mass =0.02kg
真子彈: 100=0.5*0.5v^2 v=20 ms^-1
bb子彈: 100=0.5*0.02v^2 v=100ms^1

i think so too.

bb彈快d,因為bb彈係輕過真子彈,所以我覺得應該係bb彈輕d!