RVJ Posted November 11, 2012 Posted November 11, 2012 So I'm currently working on some physics homework to prepare for an upcoming exam. We were assigned the following problem: "Calculate the rotational inertia of a meter stick, with mass 0.56kg, about an axis perpendicular to the stick and located at the 20cm mark. (Treat the stick as a thin rod.)" Here is how I attempted to solve the problem: Using the Parallel-Axis Theorem, I=Icom + Mh2 I found the Icom (using a table of values) to be: (1/12)ML2 Filling it in for the equation: I=(1/12)ML2 + Mh2 Knowing the values of every variable, I plugged in: I=(1/12)(.56kg)(1)2 + (.56)(.3)2 My final answer was: I=.097 kg-m2 But using the list of answers our Professor provided, it's supposed to be .97 kg-m2. I'm inclined to think the professor made a typo?
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