- Integrate (ln x)^48/x dx?

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Is electricity caused by protons or nuetrons naturally or does energy from the sun create electricity stored in molecules? An 80 gram sample of rock was found to contain 10 grams of radium and 70 grams of radon. What is the age of this rock? Evaluate the surface integral of G over the surface S.
S is the cylindrical y^2+z^2=144, z>0 and 3 Two point charges of magnitude +3.0 nC and +2.0 nC placed 2.0cm apart. Calculate the resultant electric field strength at their midpont? What r rocks with layers called?