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I have my Physics exam tomorrow and I have a few questions in various chapters. Measurements and uncertainties: If in a calculation, I find the answer to be 500, but the numbers that I used all have 3 significant figures, would I be able to give the answer as 500? Does that have 3 significant figures? Or would the answer be 5 x 102 ? When finding the absolute uncertainty with the percentage or maximum/minimum method, what are some rules that apply here? In my notes I wrote down that if there is addition or subtraction in the original equation, then I must add the absolute uncertainties. But when there is multiplication, division or indices, then I must add the percentage uncertainties. Is this correct? Kinematics: I'm really confused about a question in a Paper 1. "A constant horizontal force FA is applied to a block m1. Block m1 is in contact with a separate block m2. The blocks remain in contact as they accelerate along a horizontal frictionless surface. m1 has a greater mass than m2. Air resistance is negligible. Which statement is correct?" So I picked D which was "The force that m1 exerts on m2 is equal to F", but I was wrong and the actual answer was B "The force that m1 exerts on m2 is less than F". Why is that? Thermal physics: I would appreciate any common examples/questions involving the method of mixtures, since I haven't succeeded in solving one yet. By method of mixtures, I mean mcΔθ = mLf + mcΔθ. Would this equation work in every situation or should I be careful? Circular motion and gravitation: For g = F/m, if you have a satellite orbiting a planet, is 'm' the mass of the satellite or the planet? For tanθ = v2/Rg, what does 'R' represent? Is it the normal force or the molar gas constant? Also, when you write ' -g', does that equal -9.81 ms-2 or +9.81 ms-2 ? General: Does uppercase P stand for power and lowercase p stand for pressure? Also, how should I approach ratio questions?? I sometimes get them right but sometimes not. What should I start with?