finding kenetic energy?

314EPW · September 16, 2007, 03:39 PM

The formula I have is K=(1/2)(MASS)(SPEED) I must be doing something stupid because I come up with a very large number!

Mass Is 250 grains
Speed is 1600 fps what's the final foot lbs?
thanks
Ed

joneb · September 16, 2007, 03:58 PM

Mass X (Velocity)2 divided by 450,200
250x(1600x1600)divide by 450,200 = 1,422 ft/lbs

This should get you close.

rwilson452 · September 16, 2007, 05:17 PM

I Suspect the answer you originally arrived at was inch/grains not foot pounds. Yep that would be a very big number

September 16, 2007, 03:39 PM	#1
314EPW Senior Member Join Date: June 14, 2007 Posts: 108	finding kenetic energy? The formula I have is K=(1/2)(MASS)(SPEED) I must be doing something stupid because I come up with a very large number! Mass Is 250 grains Speed is 1600 fps what's the final foot lbs? thanks Ed

September 16, 2007, 03:58 PM	#2
joneb Senior Member Join Date: December 10, 2005 Location: Central , OR Posts: 1,888	Mass X (Velocity)2 divided by 450,200 250x(1600x1600)divide by 450,200 = 1,422 ft/lbs This should get you close.

September 16, 2007, 05:17 PM	#3
rwilson452 Senior Member Join Date: June 10, 2004 Location: Tioga co. PA Posts: 2,647	I Suspect the answer you originally arrived at was inch/grains not foot pounds. Yep that would be a very big number