OnlineHW11_solutions - Physics 221 Online Homework#11...

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1 Physics 221 Online Homework #11 Solutions Note: the solutions for Tutorials will not be given because they already have hints. Some of the problems are “randomized” where the numerical values in the problem are different for each student. 11.1 Tutorial: Weighing Lunch 11.2 Tutorial: A Pivoting Rod on a Spring 11.3 Tutorial: Period of a Pendulum Ranking Task 11.4 End-of-Chapter Exercise 14.52 I DENTIFY : 2 / T I mgd π = S ET U P : From the parallel axis theorem, the moment of inertia of the hoop about the nail is 2 2 2 2 . I MR MR MR = + = . d R = E XECUTE : Solving for R , 2 2 /8 0 496 m. R gT π = = . E VALUATE : A simple pendulum of length L R = has period 2 / . T R g π = The hoop has a period that is larger by a factor of 2. 11.5 Tutorial: Torsional Pendulum 11.6 End-of-Chapter Exercise 14.54 I DENTIFY : Apply Eq. (14.39) to calculate I and conservation of energy to calculate the maximum angular speed, max . Ω S ET U P : 0 250 m. d = . In part (b), i (1 cos ), y d = Θ with 0 400 rad Θ = .
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