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September 19, 2014

Homework Help: Physics Need quick help please

Posted by Leila on Wednesday, May 8, 2013 at 5:18pm.

Estimate the total binding energy for copper.
550 MeV

Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons.
E= in Joules

Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks
Physics - Elena, Wednesday, May 8, 2013 at 6:33am
Number of atoms is
N= N(A)•m/μ =
=6.022•10ēģ•0.003/63.5•10⁻ģ=2.85•10ēē.
Number of nucleons (protons+neutrons) =
=2.85•10ēē•63=1.8•10ē⁴.
Energy = 1.8•10ē⁴•550•10⁶•1.6•10⁻đ⁹ =1.58•10⁸ J

Thanks for the help but 1.58x10^8 J is wrong n I recalculated you calculation I got 1.58x10^14 J but that was also wrong so could you plz help me out.
Physics to Elena - Elena, Wednesday, May 8, 2013 at 3:16pm
I believe that the correct answer is 1.58•10đ⁴ J.
Physics to Elena - Leila, Wednesday, May 8, 2013 at 3:49pm
Thatz what I got too but itz still wrong :/ I don't know why please help me...thanks

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