SOLUTION: I was using an online calculator to figure kinetic energy. Known are mass and velocity (mass = 395,000 lbs and velocity is 500 mph.) The answer given is 3.3011e+9 ft. lbs., but I

Algebra ->  Exponents -> SOLUTION: I was using an online calculator to figure kinetic energy. Known are mass and velocity (mass = 395,000 lbs and velocity is 500 mph.) The answer given is 3.3011e+9 ft. lbs., but I      Log On


   

Question 1024973: I was using an online calculator to figure kinetic energy. Known are mass and velocity (mass = 395,000 lbs and velocity is 500 mph.) The answer given is 3.3011e+9 ft. lbs., but I don't know what this means. Can someone decipher this, please?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Kinetic energy is given in units of energy typically watts in English units or Joules in SI units.
Ft-lbs are definitely not the correct unit.
I like SI because it's more logical so converting,
m=395000%2F2.2=179545kg
v=500%2A%281.6%2F1%29%2A%281000%2F1%29%2A%281%2F3600%29cross%28mi%29%2Fcross%28hr%29cross%28km%29%2Fcross%28mi%29m%2Fcross%28km%29cross%28hr%29%2Fs
v=222m%2Fs
So then,
KE=%281%2F2%29mv%5E2=%281%2F2%29%28179545%29%28222%29%5E2=4.43x10%5E9J
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.
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Word of warning, don't use online calculators for simple calculations.
They might not yield the correct answer.