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Home Q & A Board Science-Related Homework Help Physics
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ripemangos ripemangos
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11 years ago
Hi there,

How do i find the mass if i have the answers to Energy and speed of light using einsteins equation e=mc2?

Thank you
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6 Replies
Replies
wrote...
#1
11 years ago
E = mc^2

m = E/c^2

If you know E and want to find m, divide by c^2.
wrote...
#2
11 years ago
you know what the 'm' in the equation stands for, right ? its a simple algebraic operation if you understand the equation properly..
wrote...
#3
11 years ago
plug in energy to e and speed of light to c solve for m, or mass
wrote...
#4
11 years ago
Energy / Speed ^ 2 = Mass

Thats the Einstein equation
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#5
11 years ago
I'm guessing you've got the algebra figured out.  As others have said, m = E / c^2.  The tricky part might be making sure you're using the correct units.  The speed of light should be in meters per second (use 3 x 10^8).  Energy should be in Joules.  If you've been given the energy in some other set of units, you'll need to convert.  Just Google the conversion you need, such as from ergs to Joules.  That will give you mass in kilograms.  Again, you can Google the conversion if you want mass in other units.
Answer accepted by topic starter
ripterscootripterscoot
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#6
Posts: 25
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11 years ago
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