A physics question

No, you have a problem of units:

E= Joules
M= Kgs
C= ms (metres/second)

I know.

But if we use the value 299,792 that is km/s

And then the number is 7 549 520 434 176, and according to that book that figure would be kw/h.

I am no mathematician and no physicist, so I think it is very likely that this is very wrong

E= mc^2

m=87 kg ~ 9E4 gram with rounding

c= 3E10 cm/s

c^2= 9E20 cm^2/s^2

E=81E24 gr cm^2/s^2 ~ 8E25 gr cm^2/s^2

1 gm cm^2/s^2 = 1E-7 Joule

E=8E18 Joule

1 kw hour = 3.6E6 Joule ~4E6 Joule

E=8E18/4E6 kw hour = 2E12 kw hour

You may be to high by a factor of 10, I have to recheck the conversion.

Rap

Thanks rap. The first try was off by millions I think, and even though I think the second is probably off too that will not be due to my abusing the calculator

The important question is how much it takes to set you off.

Hahaha.. yes, I would like to know that, just so I don't do it by accident

A side comment a nuclear bomb only convert a tiny percent of it mass into energy.

You would need to be a anti-matter/matter bomb to reach your goal.

Well, it's not actually my goal. It was a hypothetical situation, one I hope never to experience..

...good ! we are all saved then !

I just done the math and if our friend mass would be converted to energy if would be roughly the same as a 1890 megatons bomb.

For any one who wish to confirm this a megaton of TNT is 4*10^15 joules.

I gots the powah!!

Depends on what you mean by "nuclear bomb". When you explode one of the nuclear bombs we've invented so far, that converts only a tiny fraction of their mass into energy. For your calculation to be correct, you would either have to plug this fraction into your equation, or you would have to be a not-yet-invented type of nuclear bomb that converts your whole mass into energy.

On top of that, as Francis pointed out, you're off by a factor of 1,000,000 because you used the wrong units. (If the left side of your equation expresses energy in Joule (kg * m/s), then you need to express light speed in m/s, not km/s, on the right side of the equation.)

Units--Units--Units

To check your calculations cancel your units algebraically. If you don't end up with the desired unit, your conversion is wrong.

Rap