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visits member for 3 years, 5 months
seen Aug 14 '11 at 4:36

Aug
14
comment Effect of temperature on radioactivity?
That's perfect Chris, thanks for the link!
Aug
14
comment Effect of temperature on radioactivity?
Interesting, however I am looking for empirical evidence to the contrary.
Aug
14
comment What did Marie Curie do for atomic theory?
I still can't see the critical idea which she contributed to atomic theory.
Aug
14
comment What did Marie Curie do for atomic theory?
Well I assume it refers to the existance of smaller subatomic particles? Neutrons?
Aug
6
comment What did Marie Curie do for atomic theory?
Can you offer any insight? :)
Aug
4
comment What did Marie Curie do for atomic theory?
Thankyou - so now I'm sure you can see what my problem is! The source you quote is one that has confused me most. You will notice that, in fact, what you have put in bold is extremely vague. It states that this was 'absolutely revolutionary' and conceptually important - but what is it she actually discovered? That the ability to radiate did not depend on the arrangement of the atoms itself? If so, why was that revolutionary? JJ Thompson had already discovered the electron, so she didn't discover subatomic particles. How did she contribute to atomic theory with that observation?
Jun
27
comment Work of Marie Curie?
Thanks for the responses, but I would love to hear some thoughts not based purely on Wikipedia articles if possible?
May
30
comment Creating an ammeter?
I'm not sure what you mean, I know what a galvanometer is, that isn't the question.
May
5
comment Investigating damped Harmonic Motion in a Spring?
Can anyone point me towards some information on whether or not mass affects the damping constant? I can't find any reliable information.
Apr
18
comment How to determine viscous dampening coefficient of spring?
Okay, so what do I need to calculate c? As is obvious, I don't understand the maths behind the problem. If possible, can you just make up the data required and do an example calculation to find 'c' for me?
Apr
17
comment How to determine viscous dampening coefficient of spring?
Sorry, but the questions really aren't the same. I've asked a number of similar questions on the one general topic, that does not make the questions identical. @Robert: What I don't understand is how to find 'c'. Using the information I supplied in this question, what is the value of 'c'? Can you calculate it? Nobody has been able to actually calculate the value of it yet.
Apr
17
comment How to determine viscous dampening coefficient of spring?
Thanks Robert, but you didn't really. I can't use your equation (angular frequency = etc) as I don't know the angular frequency. It seems that the dampening coefficient is impossible to figure out, as not enough variables are ever known!
Apr
13
comment Investigating damped Harmonic Motion in a Spring?
Perfect, thankyou!
Apr
13
comment Investigating damped Harmonic Motion in a Spring?
I don't understand your accusatory tone, are users not permitted to ask two questions on the same topic?
Apr
12
comment Investigating damped Harmonic Motion in a Spring?
Well the dampening could be found by measuring the decrease in amplitude each oscillation, so you would find the factor by which the amplitude decreases. Which symbol in the above equation would that be equal to though? c or λ?
Apr
12
comment Investigating damped Harmonic Motion in a Spring?
I do understand most of it Georg :)
Apr
12
comment Investigating damped Harmonic Motion in a Spring?
Thanks Robert! This is exactly what I'm looking for. I would just measure 'k' using F=kx and altering the masses on a spring and measuring the extensions (more accurate than a stopwatch) to find k. I'm not sure how to find 'c' though, what is 'c' anyway? The 'different directions' is something I'm also very interested, do you have any additional suggestions? Thanks!
Apr
11
comment What affects the damping of a spring?
Okay, so the variables so far are: initial extension of spring (independent), period of oscillation and time for spring to stop (dependent variable) and mass of weight on spring (independent variable). What other variables are there, or perhaps more importantly, how can I find what the other variables are?
Apr
11
comment What affects the damping of a spring?
Are you able to explain the 'second order differential equation' for dampening at the wiki you linked to? I don't understand where the equation comes from, how it's used, and none of the letters/symbols in the equation are defined on the site..
Apr
11
comment What affects the damping of a spring?
I understand what independent and dependent variables are, but not how to figure out what they are in this scenario. It seems the frictional force is one variable, and I'm assuming that would need to be a controlled variable. Judging by the 'second order differential equation' the initial extension of the string is also a variable. I assume there must be many others, but I can't find any info on the topic. Doing a simple search for 'variables in dampening shm' finds nothing.