Talk:FN 5.7×28mm

message: The listed mass of the SS90 AP FMJ round doesn't seem right. The listed value for the kinetic energy is 540 J, however if you use KE=(1/2)(m)(v)^2 the actual value should be around 360 J, using the values m=1g and v=850. If you rearrange the equation using the listed kinetic energy and velocity to solve for mass, m=2(KE)÷v^2, the value of the mass should be near 1.5g. Is this an error, or is there a reason for this strange energy output?
(Or alternatively if you solve for velocity while keeping kinetic energy and mass the same the result comes out about 1,040 m/s.)
BradandRose725 (talk) 06:13, 8 May 2013 (UTC)
replies: text: The SS90's mass is 1.5g, not 1g. The table shows it as 1g due to its display properties. ROG5728 (talk) 17:50, 8 May 2013 (UTC)
replies: text: Ah, I see now. Thanks for clearing it up. That makes much more sense, before I also didn't check the conversion between grains and grams(23 grains comes out at around 1.5g). Anyways, thanks again for clearing up my confusion and sorry for causing any trouble.BradandRose725 (talk) 06:12, 9 May 2013 (UTC)
thread_title:  Bad numbers on SS90 AP FMJ? 

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