how much energy does an object with a mass of 5 grams have? how to plug in e=mc squared?

Question

anonymous · Answer

M is mass which is 5.

anonymous · Answer

but what is E

anonymous · Answer

$E = 5c^2$

dan815 · Answer

depends on the speed its travelling at

dan815 · Answer

is your mass travelling at light speed thats the only time you can use e=mc^2

anonymous · Answer

lets say it is

dan815 · Answer

then ya E= mc^2
u know m=5*10^-3 kg and c=3.0*10^8 m/s

wolf1728 · Answer

I believe for the E=mc² equation to work, it deals with mass being converted directly to energy.  Convert a paper clip (about 1 gram) directly to energy and you get the energy equivalent to the Hiroshima bomb.  (about 20 kilotons)

anonymous · Answer

alright thanks guys

wolf1728 · Answer

Want to learn a bit more? Here's a good link http://www.1728.org/einstein.htm (Well it is a web page of mine.)

dan815 · Answer

i hate to be a stickler but kilotons is not a unit of energy

dan815 · Answer

usually when they give mass they say something like 20 kilotons of TNT is that what u mean

wolf1728 · Answer

It is short for the explosive power of 20 kilotons of tnt.
(trinitrotoluene)

dan815 · Answer

again 20 kilotons is not short for anything xD

wolf1728 · Answer

Wikipedia says The "ton of TNT" is a unit of energy equal to 4.184 gigajoules Here's the link: http://en.wikipedia.org/wiki/Kiloton

dan815 · Answer

but i see thanks.. good to know :)

anonymous · Answer

1.21 gigawattz! great scott

wolf1728 · Answer

thanks dan815 - this message board keeps everybody sharp :-)

dan815 · Answer

1.21 gigawattz is power, u need your answer in joules

anonymous · Answer

i know i was referencing a movie

wolf1728 · Answer

see?  good one dan815

dan815 · Answer

lol

wolf1728 · Answer

Back to the Future?

dan815 · Answer

what movie ?

dan815 · Answer

whats so great about back to the future i cant seem to sit through that movie

anonymous · Answer

the future one

dan815 · Answer

that movie feels too old to watch

dan815 · Answer

i mean theres some really old movies i like a lot but

anonymous · Answer

preference i presume

anonymous · Answer

depends what your into

wolf1728 · Answer

1985 I believe

dan815 · Answer

oh man its late for me!! i got exam tomorrow

dan815 · Answer

cya guys later

anonymous · Answer

good luck

wolf1728 · Answer

c ya 
Think I'll find another question

anonymous · Answer

bye guys

wolf1728 · Answer

c ya