Figuring Energy of a round

[Dave Waits]

Colonel, mine is the same, just modified to use with a standard pocket calculator. Plugging your 115 grain 9mm at 1145 into mine I come up with 334.7 FPE. This way you don't have to break down the velocity to a managable size. also, for all practical purposes, .2 FPE is a non-existant problem. It's just a faster way to do it, unless you're a Math-Junkie who enjoys the minutia.

[TLE2]

I don't if any of you noticed, but this is cut from the same cloth as the famous equation for energy from mass E=Mc2

[ColMike]

Originally Posted by TLE2

I don't if any of you noticed, but this is cut from the same cloth as the famous equation for energy from mass E=Mc2

and C is the speed of light.

[TLE2]

Right, energy = mass times velocity squared.

[Riverpigusmc]

Bump.

[reddoggm]

Ok I don,t know if I,m sneaking in on a Sticky (without permission ) OR for Dummys Like me that Chrono and want a Quick Figure I go Here--http://www.handloads.com/calc/quick.asp Hope I,m not over stepping some Site Rule here
By the way I looked for a RULES Sec here and I couldn't believe my Monitor
I couldn't find One
DOGG!!!

[Rick McC.]

Very handy, thanks!

[Riverpigusmc]

bump. Time to get some gun threads up

[DrHenley]

Originally Posted by ColMike

The ICAO standard accepted for the gravitational constant is 32.1742 which gives 450,437.4. Speer uses this standard number for acceleration due to gravity. Although several online sources use the alternate value, I can not find a 'why' to the use of it.

Because of the different centrifugal force, the gravity at the equator is smaller than that at the poles. So the precise gravitational acceleration is a function of latitude. They just took the gravitational acceleration at 45° Latitude (halfway between the poles and the equator) as the standard. Paris is at 48.86°, New York City is at 40.67°.

Poles: 32.26 ft/s²
Equator: 32.09 ft/s²
45° Latitude: 32.17 ft/s²

[ColMike]

[QUOTE=DrHenley;74487]Because of the different centrifugal force, the gravity at the equator is smaller than that at the poles. So the precise gravitational acceleration is a function of latitude. They just took the gravitational acceleration at 45° Latitude (halfway between the poles and the equator) as the standard. Paris is at 48.86°, New York City is at 40.67°.

Poles: 32.26 ft/s²
Equator: 32.09 ft/s²
45° Latitude: 32.17 ft/s²[/QUOTE

Excellent, thanks!