Recent content by aborder

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...

Well that worked most excellently. Thank you. How did you see to do that?

That sounds like a good idea conceptually, but I'm not sure how to figure this mathematically.

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...

Excellent, thank you.

502.4 +/- 0.05

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.

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.

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...

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.

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?

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...

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...

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...