- Which is heavier: a proton or an electron?

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Can you get liquid mercury from a fluorescent lightbulb containing mercury? A 1.38-kg book is at rest on a wooden board inclined at 13 degrees. Find the magnitude of the force of static friction.? F(x, y) = sin(2y/x) and u is unit vector in direction (1, 2).? What is the null hypothesis for r? How do I make my brain smarter for math and stuff like we don't know?