Recent content by aborder

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    Calculating Speed of Rotating Disks and Hoops Using Uniform Solid Disk Equations

    Homework Statement A uniform solid disk of radius R and mass M is free to rotate on a frictionless pivot through a point on its rim (see figure below). The disk is released from rest in the position shown by the copper-colored circle. (a) What is the speed of its center of mass when...
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    How do I determine the center of mass for a rod with varying linear density?

    Well that worked most excellently. Thank you. How did you see to do that?
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    How do I determine the center of mass for a rod with varying linear density?

    That sounds like a good idea conceptually, but I'm not sure how to figure this mathematically.
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    How do I determine the center of mass for a rod with varying linear density?

    Homework Statement A rod of length 36.00 cm has linear density (mass per length) given by λ = 50.0 + 21.5x where x is the distance from one end, and λ is measured in grams/meter. A. Find Total Mass B. Find center of mass from x=0 Homework Equations 1/M(integral)xdm , where M...
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    Absolute Uncertainty - Enough Information?

    Excellent, thank you.
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    Absolute Uncertainty - Enough Information?

    502.4 +/- 0.05
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    Uncertainty with a simple pendulum

    No, I wish I did mis-read it. The value is +/- 0.4%. I asked my instructor last night and he didn't give me a reply. He wasn't at school today either. When I get an answer, I'll post it. Thanks for the help.
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    Absolute Uncertainty - Enough Information?

    Wouldn't it also be + 0.05 as well if the meter rounds to the nearest tenth? I guess we really don't know since there isn't any additional information provided.
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    Absolute Uncertainty - Enough Information?

    I suppose that it would read 502.4 because it rounds to the nearest tenth. I guess we assume that when only the tenths place is given. The thing is, how do I know what to assume when this isn't discussed in the text. Yah, fire always brings me comfort. Especially when it involves burning...
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    Absolute Uncertainty - Enough Information?

    So then are we saying with absolute certainty that the measurement is 502.4g since no other information is given? Therefore, the uncertainty would be +/- 0.0. Obviously if we were given 502.2 - 502.6 we would know the uncertainty to be +/- 0.2.
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    Absolute Uncertainty - Enough Information?

    That's funny because I was thinking the same thing. Unfortunately it is straight out of a textbook so nothing is given other than the question itself. Not sure how to approach this one. Any ideas?
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    Absolute Uncertainty - Enough Information?

    Homework Statement If an electronic scale reads 502.4 g, what is the absolute uncertainty in the mass reading. Homework Equations Not sure The Attempt at a Solution Not a clue, it seems that there isn't enough information given. How am I supposed to figure out the absolute...
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    Uncertainty with a simple pendulum

    That makes sense to divide by the highest and multiply by the lowest to get the low end and vice versa. Using the method you described, I got 9.79 +/- 0.184. The answer in the book gives 9.77 +/-0.04 with a relative uncertainty of 0.4%. The relative uncertainty is given by this: Relative...
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    Uncertainty with a simple pendulum

    A simple pendulum is used to measure the acceleration of gravity using T=2pi(sqrt(L/g)) . The period T was measured to be 1.24 ± 0.02 s and the length L to be 0.381 ± 0.002 m. What is the resulting value for g with its absolute and relative uncertainty? So the first thing I did was to isolate...