here's the problem: an 8lb object traveling at 1000ft/sec has what energy in ft-lb?
formula E=½*m*v²
my calculation yields 8(1000*1000)*0.5=4,000,000ft-lb
a co-worker's calculation converts to grains and divides by a "fudge factor"
((8*7000)*1000*1000)/450500=124,320ft-lb
an online physics calculator comes up with the same result as the convoluted formula that converts to grains.
so why is my simple version of the calculation off by a factor of 32?.... or is it? i don't see what's going on here.
formula E=½*m*v²
my calculation yields 8(1000*1000)*0.5=4,000,000ft-lb
a co-worker's calculation converts to grains and divides by a "fudge factor"
((8*7000)*1000*1000)/450500=124,320ft-lb
an online physics calculator comes up with the same result as the convoluted formula that converts to grains.
so why is my simple version of the calculation off by a factor of 32?.... or is it? i don't see what's going on here.