Adama18 Posted September 7, 2015 Share Posted September 7, 2015 I have been looking at the Anzio 20mm rifle for work and it is has 22,000 foot-pounds of kinetic energy and I what to know how fast that is in miles per hour Link to comment Share on other sites More sharing options...
swansont Posted September 7, 2015 Share Posted September 7, 2015 I have been looking at the Anzio 20mm rifle for work and it is has 22,000 foot-pounds of kinetic energy and I what to know how fast that is in miles per hour Kinetic energy is not speed. You need to know the mass of the bullet, and then you can solve KE = 1/2 mv2 Link to comment Share on other sites More sharing options...
Adama18 Posted September 7, 2015 Author Share Posted September 7, 2015 Oh right yeah thanks for that:) Link to comment Share on other sites More sharing options...
imatfaal Posted September 8, 2015 Share Posted September 8, 2015 I have been looking at the Anzio 20mm rifle for work and it is has 22,000 foot-pounds of kinetic energy and I what to know how fast that is in miles per hour For work? That's a military spec anti-materiel rifle. Convert 22,000 foot pounds to joules - 29,828 joules Convert 800 grains to kilograms - .0518 grams KE = 1/2 mass * velocity squared velocity = 1072 m/s which is awfully fast Convert 1072 m/s to miles per hour - 2,398 mph. And you need this for work? Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted October 7, 2015 Share Posted October 7, 2015 For work? That's a military spec anti-materiel rifle. Convert 22,000 foot pounds to joules - 29,828 joules Convert 800 grains to kilograms - .0518 grams KE = 1/2 mass * velocity squared velocity = 1072 m/s which is awfully fast Convert 1072 m/s to miles per hour - 2,398 mph. And you need this for work? grams should read Kg (which you obviously knew when you calculated) but where did the 800 grains come from to give you the mass? Is that a standard bullet for that rifle, on which the 22,000 foot pounds is based? Link to comment Share on other sites More sharing options...
Acme Posted October 7, 2015 Share Posted October 7, 2015 (edited) For work? That's a military spec anti-materiel rifle. Convert 22,000 foot pounds to joules - 29,828 joules Convert 800 grains to kilograms - .0518 grams KE = 1/2 mass * velocity squared velocity = 1072 m/s which is awfully fast Convert 1072 m/s to miles per hour - 2,398 mph. And you need this for work? I'm seeing 1600 to 1700 grains for bullet weight. US Shooter.com 20×110mm USN @ Wiki 1600 grains = 103.6783g = 0.1036783kg v=758.55m/s = 1,696.82mph So Mach 2.23 for a 1600 grain round compared to Mach 3.15 for a 800 grain bullet. Can you hear me now? At around $13,000 and ~$15 per round for practice loads, Anzio touts the 20mm rifle as "huge amounts of fun". Mag-Fed 20MM Rifle [ Edited October 7, 2015 by Acme Link to comment Share on other sites More sharing options...
imatfaal Posted October 7, 2015 Share Posted October 7, 2015 grams should read Kg (which you obviously knew when you calculated) but where did the 800 grains come from to give you the mass? Is that a standard bullet for that rifle, on which the 22,000 foot pounds is based? The wiki page for the gun showed two or three different rounds - one of which was a lighter bullet with the amount of energy listed in the OP The Anzio 20/50 has approximately 22,000 foot-pounds (29,828 J) of kinetic energy with an 800-grain bullet. It does this by effectively taking the .50 BMG projectile, which already is relatively large and travels extremely fast, and effectively increases the already supersonic bullet to over 1.3 times its normal flight velocity, creating more kinetic energy without the need for a larger and heavier projectile. Link to comment Share on other sites More sharing options...
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