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# Kinetic Energy

#1
05-16-2008, 10:55 PM
 Bronze Member Join Date: May 2007 Location: SW MS Posts: 44
Kinetic Energy

I have forgotten and lost the formula for finding kinetic energy, does anyone have it handy?
__________________
"The most terrifying sound in nature is not the roar of a charging lion, nor the whistle of a descending bomb; rather it is a click when you expect a bang." - Peter Capstick
#2
05-17-2008, 06:24 AM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,783
KE=(1/2)mV²where m = mass of object
v = speed of object
---------------------------------------------------------------
For a bullet it goes like this:

Formula used:
Energy = 1/2* weight * velocity^2 / 7000 / 32.175

Where weight is in grains, and velocity is in feet/second.

7000 is grains per pound to convert the bullet weight
into Lbs; and 32.175 is acceleration due to gravity.
-----------------------------------------
Or we can just say:

Energy = weight * velocity^2 / 450450

450450 comes from (7000*32.175*2)=450450
---------------------------------------------------
Example:
Bullet = 117 gr. MV=2900 ft/sec
Energy = 2900*2900*117/450450 = 2184.4 ft/lbs
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__________________
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-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!
#3
05-17-2008, 10:33 AM
 Bronze Member Join Date: May 2007 Location: SW MS Posts: 44
Thanks, I feel stupid, I have used that formula so much in the past, I didn't even need a calculator. Guess I know which brain cells didn't make it.
__________________
"The most terrifying sound in nature is not the roar of a charging lion, nor the whistle of a descending bomb; rather it is a click when you expect a bang." - Peter Capstick
#4
05-17-2008, 01:50 PM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,783
Quote:
 Originally Posted by telkev Thanks, I feel stupid, I have used that formula so much in the past, I didn't even need a calculator. Guess I know which brain cells didn't make it.
Telkev,
don't mistreat yourself like that, I went to take an engineering test for a job, 3½ hours and in one of the question I needed the formula for a sphere's volume and I just could not remember it. And that I have used more than the KE formula.;) Starts happening after 40. LOL
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!

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