What is the energy of an electromagnetic wave that has a frequency of 4.0 x 10 ^9 Hz A= 1.7 x 10^43 J
B=1.7 x 10^-43 J
C=2.7 x 10^24 J
2.7 x 10^-24 J
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Modify the equation fδt=δ (mv) to find the force of friction.

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Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value