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j/cm2???

回覆 1# 的帖子

1 Joule =  1 J
mps = meter per second = m/s
I duno what is "j/cm2", since it is not a common unit, we only have N/mm2 (pressure)

Do you mean E=0.5 m v^2 ?

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回覆 4# 的帖子

Just learned something new...
If the limit is 20 J/cm2,
then the cross-section area of a 6mm bb = 3.1416 * 0.3^2 = 0.28 cm2
then allowing 5.6 J???

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