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  1. http://www.ibsurvival.com/topic/39394-p1-physics-question/ @Ignacio
  2. Why is the answer to this question B? Could someone please explain?
  3. @Vioh Yes, that makes more sense! Followed your advice!
  4. Hey guys, I need some serious help... So I am doing my physics IA on the infinite ladder resistor and when I try to propagate uncertainty I get ridiculously big numbers (i.e. 150300%). How can I do it? This is the problem I am approaching--> (I am adding more and more loops to see if it reaches the golden ratio) In order to do this, the next resistance is in theory given by the expression attached. So I am propagating uncertainty by adding percentage uncertainties by that expression because I cannot work out the absolute uncertainty of Rn as it is composed of several loops (In order to get more loops you have to multiply, add, etc). However if I add the percentage uncertainty of R0 which is 1,1 three times and I add the percentage uncertainty of Rn (2 times as it appears in the expression) to get the percentage uncertainty of Rn+1, uncertainty becomes cumulative and ridiculously big... How do I approach this? I only know the value of R0 and its uncertainty which would potentially be R in the diagram shown above. Please help!!! please please
  5. TOK is not ethics! Be careful! Try to construct a knowledge question, it is way safer. Read the guide, and make sure that you include TOK terms, areas of knowledge, etc...
  6. It's to do with Archimedes principle, what happens if an object is floating? Wouldn't the bouyancy force then equal to the weight of the body that's floating, even if it doesn't make much sense, but there are no more forces acting are there?
  7. Hey! So, how should I go about evaluating sources? Should I include the sources being evaluated as appendices or how should I do it? The information I have under the Summary of Evidence section is basically events and opinions, but nothing I could analyze in depth as in documents and stuff? If I understood well, they examiner does not have to read the appendices, so would it be okay for them to be appendices or should they be in the Summary of Evidence section??
  8. For our chemistry class, we were asked to find the empirical formula of hydrated copper sulfate, heating it and finding the moles of anhydrous copper sulfate and water using stoichiometry. My question is that when hydrated copper sulfate (has a blue color) turns into anhydrous copper sulfate (the water evaporates and it is a white/grayish color), while we carried out the experiment it turned slightly green. What could this possibly mean? Could it be that perhaps we "overdid" the experiment or maybe the equipment was "contaminated" and it contained HCl or something? What would be the scientific explanation behind that? I tried looking it up on the internet, but I dont seem to find a reasonable answer. Thanks in advance!
  9. The only possibility that I can think of is that there must be something wrong with your answer keys. The correct answer for this question is A without a doubt Alright yeah, I thought so too, but I still wanted to doublecheck. Thank youu
  10. I am reviewing for a test. I can't work out how B is the correct answer. I look at the possible answers now and I would most probably choose A. It gives us a velocity-time graph and we're supposed to find the corresponding acceleration-time graph. I don't quite see how B works in the sense that acceleration seems to be constant, yet how does that make sense if the function is not linear, doesn't the acceleration vary? It's in Spanish, but I don't think that should matter too much. Thanks in advance wait what. I'm sorry, I'm new to this. The picture is there twice whoops.
  11. Hey! Engineering is based on mathematics and the level of maths is quite advanced, so even if universities don't ask for it, I don't think you will be able to cope up with engineering if you don't know a lot of math. I honestly think that if engineering is your true passion, you should go for maths sl or higher, it's worth the effort.
  12. Here wait, we have just studied this so I should be able to help you. The guy who replied is right, what do you not understand?
  13. I am bilingual, like completely fluent in both English and Spanish. I'm Spanish so it's my mother tongue but I lived abroad for some years, so that's why I speak English. I am currently learning French, but to tell you the truth, I can't speak it fluently... but I understand when people speak it. So I guess that makes two and a half languages?
  14. I am doing a lab report on Hooke's law, and I'm trying to find the constant "k" of a spring. I am having an issue with the positive and negative signs. To do the experiment, we placed different weights on a spring and measured how much it stretched out. So now, the force we got was mass (the one we placed to stretch the spring out) times gravity, should the force be negative since the acceleration due to gravity is negative? I understand that the - sign in F=-kx is not because the constant is negative, but because x is negative? I am assuming that the constant is meant to be positive. Could you please clarify what is negative and what is positive? I am a bit lost. Thanks in advance!
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