Please solve only number 2 3. PRELAB QUESTIONS In the following problems, assume

Question

Please solve only number 2

3. PRELAB QUESTIONS In the following problems, assume the following parameters: Mass of the bottom steel disc: 1.468 kg. Mass of the upper steel disc: 1.479 kg. Mass of the upper aluminum disc: 0.461 kg. Radius of each disc: 63.3 mm. Radius of the take-up spool: r 1.25 cm. Mass of the falling weight: 25 grams. 1. Using the values given above, calculate the following: a) The moment of inertia of the lower, steel disc. b) The moment of inertia of the upper, steel disc. c) The moment of inertia of the upper, aluminum disc. d) The combined moment of inertia of the two steel discs. roblem 1, what percentage error is made by neglecting mr with respect to / in equation (101)? 3. Suppose that the counter is reading 400 counts per second at some moment. What is the value of o at that moment?

Explanation / Answer

The lab manual has the equation

a = mgr / (mr2 + I)

Hence the value of I becomes

I = Mgr/a - mr²

In problems 2 they ask you to find the percentage error. So here for comparisons, you can consider

I = mgr/a as the final and I = mgr/a - mr2 as initial value.

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