# EP Chap10 - Hints Chap 10 Rotation Note this is an outline...

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1 Chap 10 Rotation Note – this is an outline of the lecture, print this and take notes on it in lecture It is not the and take notes on it in lecture. It is not the complete lecture. You should attend lecture to get the complete notes Images taken from Halliday/Resnick/Walker, Fundamentals of Physics, 7 th Edition, John Wiley and Sons Inc., by permission. Hints: 17. a) You know (or should be able to deduce) ω , ω 0 , and α and you want to find , b) You will need to solve (quadratic equation) to find t. 55. a) Find a directly from the distance and time given in the problem. b) Apply Newton’s 2 nd law. e) Apply Newton’s 2 nd law for a rotating object e) Apply Newton s 2 law for a rotating object. 61 Look at motion of center of mass. Apply conservation of mechanical energy. 65. Find moment of inertia. Note that you will need to use the parallel axis theorem. Then use conservation of energy to find the angular speed when the rigid assembly is inverted. Rotational variable r θ s r s θ θ θ π θ = Δ = = nt displaceme Angular [radians] 2 revolution 1 [radians] / 1 2 dt d t av av θ ω θ ω = Δ Δ = locity angular ve ous Instantane locity angular ve Average Rotational variable-cont r θ s ω α Δ = on accelerati angular Average dt d t av ω α = Δ locity

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