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Hi I'm wondering if you could briefly describe how pulleys work. I believe they create mechanical advantage. What are the important things to remember with pulleys. Thank you

Hello I have a very important question. I really do understand why it takes energy to remove a electron from a atom. Because the electron is negatively charged and drawn toward the nucleus which is positive. Electron affinity is very confusing because it says that adding a electron to a atom releases energy. But electrons, especially the outer electrons are high energy so I seem to think that adding an electron adds energy to the atom instead of releasing. Thank you very much for helping

Hello, Im wondering if you could explain how 10^-2 is 1/100 and how to apply this to log base 10. Thank you