Wednesday, April 14, 2010

A. Find the energy equivalence of an electron of mass 9.26e-31 kg. Answer in units of J.?

A. Find the energy equivalence of an electron of mass 9.26e-31 kg. Answer in units of J.





B. Find the energy equivalence of a uranium atom of mass 4.85-25 kg. Answer in units of J.





C. Find the energy equivalence of a paper clip of mass 2.42g. Answer in units of J.





D. Find the energy equivalence of a bowling ball of mass 6.23 kg. Answer in units of J.

A. Find the energy equivalence of an electron of mass 9.26e-31 kg. Answer in units of J.?
A. The energy equivalence of an electron of mass 9.26e-31 kg. is E = mc^2= ( 9.26 10^-31 ).(9*10^16) = 8.334*10^- 14 J





The energy equivalence of an electron is 8.334*10^-14 J


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B .The energy equivalence of a uranium atom of mass 4.85*10^ -25 kg is E= mc^2= ( 4.85 10^-25 ).(9*10^16) =


4.365*10^-8 J





The energy equivalence of a uranium atom is 4.365*10^-8 J


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C the energy equivalence of a paper clip of mass 2.42g=E=mc^2=2.42*10^-3*9*10^16= 2.178*10^14 J





The energy equivalence of a paper clip E= 2.178*10^14 J


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D The energy equivalence of a bowling ball of mass 6.23 kg. is E=mc^2=6.23*9*10^16=5.607*10^17 J





The energy equivalence of a bowling ball is E=5.607*10^17 J
Reply:Since mass is a form of energy (called rest energy), with its energy given by m*c^2, you need to multiply each of these masses by c^2 (the speed of light squared). The speed of light is 299792458 m/s and 1 J = 1 kg*(m/s)^2. That should do it.


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