# Maths / physics

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Calculate the rest mass (In grams) of an object whose rest energy is equal to the energy released by a tonne of tnt the energy liberated by 1 g of tnt = 4kJ

Rest energy = moc 2

1 tonne of tnt equals 10^6 x 4kJ =
4 x 10^6 kJ x (3.0^8)sqrd = 3.6 x 10^23kJ
is this right ?? i cannot work out the grams can anyone help please .. thanks

• Maths / physics -

You're done. J * (m/s)^2 = kg
Your result is 3.6*10^23 kg, not J

Always keep track of the units!!!

• Maths / physics -

Thank you ....

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