Express in eV (or keV or MeV if more appropriate): Part A The kinetic energy of

Question

Express in eV (or keV or MeV if more appropriate):

Part A

The kinetic energy of a Li++ ion that has accelerated from rest through a potential difference of 6000V .

Express your answer to two significant figures and include the appropriate units.

Part B

The potential energy of two protons 7.0fm apart.

Express your answer to two significant figures and include the appropriate units.

Part C

The kinetic energy, just before impact, of a 170g ball dropped from a height of 0.90m .

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a)

Kinetic energy

KE=qV =(2*1.6*10^-19)*6000

KE=1.92*10-15 =12 KeV

b)

U=KQ2/r =(9*10^9)(1.6*10^-19)/(7*10^-15)

U=3.3*10-14 J or 205.7 KeV

c)

KE=mgh =(0.17)*9.8*0.9

KE=1.5 J or 9.4*1012 MeV

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