Recent content by Orha

First off I wanted to say thanks for the reponses. It seems to me you say we define the torque according to the angular momentum so that explains the direction of torque (the reason this is weird for me is because in class we defined torque before we defined angular momentum and only after...

Homework Statement Hi everyone, I am a first year physics student and we recently learned about torque. Every time I think I understand it something else comes up to confuse me - this time it is the direction. I tried looking in the forum and generally in google, but everyone only explains the...

Thanks so much! I am looking up uneven error bars and I also came across a pdf from the University of Washington which explains it fairly well.. You have been so helpful! Thanks again!

Yes, I am also required to fill it into a table. Up until now (meaning in the previous lab, because this is only the second one we are doing) we have been told the format of a measurement is x±Δx so I assumed that both the upper and lower error bounds have to be the same..

There isn't? How can the value not be half way between the error bars? I assumed that it has to be in the middle and thus because ln(x+Δx) doesn't equal ln(x) + ln(Δx) then the value of the middle point would not be ln(x). I thought I understood it but now that you are saying it doesn't have to...

You are right I I think, the value will be (ln(x+Δx)+ln(x-Δx))/2 and the error will be |(ln(x+Δx)+ln(x-Δx))/2-ln(x-Δx)|=|(ln(x+Δx)-ln(x-Δx))/2| That saves calculations, thanks! And yes, we need to say what the errors are for each measurement and then graph it with error bars.

I have an Idea (I am sorry I am resisting your Taylor expansion, its just I know that it's not what they want us to do..) If I calculate ln(x-Δx) and ln(x+Δx) and take the average that should bring me my new linearized x value, I will call it y, no? And then I can take that y value and subtract...

Sorry if this is starting to get too much.. my intent really isn't to have you solve the problem for me, but I still not 100% sure of things, for reasons that have a bit less to do with physics maybe. Using Taylor expansions I think I understand how you mean to solve it and what to generally do...

Ok, I think I am starting to understand.. but then now I really don't know what to do. So you are saying the logarithm is from ln(x-Δx) to ln(x+Δx). So the values I calculated to be ln(x) are also wrong, as I need to split the ln(x-Δx) to ln(x+Δx) to look like y +-Δy (where y is some form of x...

Thanks for the response, sorry that I wasn't precise. The error I mean is the one derived by the measurement tool. In this case we used a meter ruler to measure the length of the ruler and a stopwatch to measure the time. The error for the meter ruler is 0.5mm = 0.0005m and for the stopwatch it...

Homework Statement I did a lab this week measuring periods of swings of a simple pendulum. We need to curve fit the equation T=k*l^n and we got ln(T)=n*ln(l)+ln(k), and we need to plot the data we collected into the linear graph, meaning out y axes is ln(T) and our x axes is ln(l). So far all...

Thanks ehild! I got to the equation you said but I didn't think I was allowed to say that the y-axis was dependent on x and y together (and same goes for x axis).. I thought it was only allowed to be dependent on some form of y alone.. I knew I was misunderstanding something, you saved me so...

Thanks for the fast reply! From my understanding I am not allowed use a or b in the definition of my axis. the y-axis should be defined by y (in any form or way such as ln(y) or 1/y or y^2 or any combination and way of presenting y) and same goes for x. That is because a and b are unknowns that...

Ok, first week of first year of undergraduate physics lab and they explain that we want all our graphs to be linear, and in order to do that we can change our x and y axes to be log(x) or y^2 or whatever. They did some simple examples such as y=(k/x)+c and explained that if the x axes is 1/x we...

Thanks NegativeDept, that's comforting to hear. Another question. Is doing a mixed degree a lot harder than a focused degree? In the university I'm going to (Hebrew University of Jerusalem) both degrees have the same amount of credit points (just the mixed splits it into two categories) but it...