IB Smacher Glau Posted November 22, 2011 Report Share Posted November 22, 2011 A question plz , to get a 6 in physics Hl , requries me 1. Study Teacher notes 2.Solve & read Tskos book 3. Past papers so if i did this daily i might get a high grade ( hopefully ) ... Also HL in total contains how many topics ? i know that SL have 8 topics + 2 options Reply Link to post Share on other sites More sharing options...
Drake Glau Posted November 22, 2011 Author Report Share Posted November 22, 2011 Same number of topics but HL has extensions. So for SL you'd do like half of topic n then if you were HL you'd do even more of the topic. Still 2 options.I could be wrong, I'm basing this kind of off chemistry and hoping physics follows along. You can however open up your handy dandy equation packet that has all the equations listed by topic which would give you the name and number of all the topics. Just remember that is the topic is a LETTER, it is an option, not core. Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted November 22, 2011 Report Share Posted November 22, 2011 Guys any help i need Physics AHL notes , i didn't find any in the files !! Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted November 22, 2011 Report Share Posted November 22, 2011 Why not read your textbook, and make them yourself? It's a much better way to learn. 3 Reply Link to post Share on other sites More sharing options...
@racheltutaia Posted November 23, 2011 Report Share Posted November 23, 2011 Hey guys!! i know this may be highly improbable seeing as you guys live all over but is there by any chance that you may know any physics tutors living in Shanghai, China?? I'm struggling a lot in class and it would be amazing if you guys know somebody that could help me out. Thanks lots Rachel Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted November 25, 2011 Report Share Posted November 25, 2011 Question : About electromagnetic incduation this is the equation FE=eE=FM=evB= V=vBLhow did we get V=vBLplz explain !! Reply Link to post Share on other sites More sharing options...
Award Winning Boss Posted November 25, 2011 Report Share Posted November 25, 2011 Derive expressions for the kineticenergy, potential energy and totalenergy of an orbiting satellite.any idea?Make the notes yourself? At least say you've attempted... Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted November 26, 2011 Report Share Posted November 26, 2011 Anyone know how to do this? I think the answer in the QB is wrong, because (I think) it assumes the mass of the bullet and plasticine are constant Reply Link to post Share on other sites More sharing options...
mantaip Posted November 26, 2011 Report Share Posted November 26, 2011 Hey, I'm a Physics SL, in the middle of one of my lab reports. I'm terribly stupid, when it comes to Physics and I have a question.I'm describing the Acceleration vs. Height of the tube graph. Maybe you know that one? When the ball has to roll through the tube and you have to calculate the acceleration, by changing the height of the tube?I managed to make a graph, even my teacher approved it, when I showed it to her. But now I have to comment, why the graph is exponential and I have NO CLUE. I've got the equation, but that is not commenting, so I'm stuck. Maybe someone could please explain?.. Reply Link to post Share on other sites More sharing options...
Procrastination Posted November 30, 2011 Report Share Posted November 30, 2011 Hey IBers , I need help with this question: The coefficient of kinetic friction for a 21kg bobsled on a track is 0.10. What force is required to push it down a 6° incline and achieve a speed of 63km/h at the end of 75m? And this one: A window washer pulls herself upward using the bucket-pulley apparatus shown in the figure . The mass of the person plus the bucket is 63kg. How hard must she pull downward to raise herself slowly at constant speed? If she increases this force by 12% what will her acceleration be? I know I have to use some trigonometry (or at least I think so) for the first part. Please show all working, thank you guys Reply Link to post Share on other sites More sharing options...
IMiguelO Posted January 5, 2012 Report Share Posted January 5, 2012 I don't get how to do this simple problem about power and efficiency without the Time:If I have 75 watts car which is 70% efficient find its top speed ( m =1000kg )Formulas are:Power= work done/timePower= Energy/TimePower=Force*Velocityand if I get the Energy I can use:Ke= mv^2/2 Kinetic Energy= Mass*Velocity^2 / 2 Reply Link to post Share on other sites More sharing options...
Drake Glau Posted January 5, 2012 Author Report Share Posted January 5, 2012 (edited) 75W=75J/s=a Ke of 75, with 70% efficiency that's 75*0.775*0.7=(1000000*V)/2V2=[(75*0.7)*2]/mYou had it all done already in your post, you just weren't seeing the P=W/t=E/tEdit: Answering your question over not having a time. Top speed is an instantaneous rate so you can assume it to be only 1 second which basically turned your power given directly into energy without any calculations. Edited January 5, 2012 by Drake Glau Reply Link to post Share on other sites More sharing options...
The Rainbow Connection Posted January 23, 2012 Report Share Posted January 23, 2012 Hello everybody! I'm writing some physics notes at the moment, and I got really stuck on understanding uncertainties. I was hoping if somebody could provide a simple explanation to uncertainties. What is the difference between limit of reading and uncertainties? Is the uncertainty the 0.1 in this example? 1.2 s ± 0.1. Please help me understand!! Thanks! Reply Link to post Share on other sites More sharing options...
neek Posted January 23, 2012 Report Share Posted January 23, 2012 (edited) I'm doing my physics IA into simple harmonic motion and using the equation T = 2π*√m/kHowever, when I find out k by changing round the equation, the units do not make senseBy manipulating the equation: k = (2π/(T/√m))²This would mean the units for k are s/kg^1/2But the units for k the spring constant is normally N/m or kg/s2 ??Can anyone help me out? Thank you in advance. Edited January 23, 2012 by neek Reply Link to post Share on other sites More sharing options...
Drake Glau Posted January 26, 2012 Author Report Share Posted January 26, 2012 (edited) I just redid your rearrangement and got 4mpi^2/T^2=k which would be kg/s^2 Might want to check your math with that equation. T=2pi*sqrt(m/k) T/2pi=sqrt(m/k) (T/2pi)^2=m/k (T/2pi)^2=T^2/4pi^2 T2/4pi2=m/k k=m/(T2/4pi2) k=4pi2m/T2 Edited January 26, 2012 by Drake Glau Reply Link to post Share on other sites More sharing options...
The Rainbow Connection Posted February 12, 2012 Report Share Posted February 12, 2012 (edited) Is Newton the only unit of force? Also I am a bit confused about the different types of forces... what is the name given to forces such as using a stapler? or forces that produce a twisting action? Thanks in advance Edited February 12, 2012 by The Rainbow Connection Reply Link to post Share on other sites More sharing options...
Drake Glau Posted February 12, 2012 Author Report Share Posted February 12, 2012 (edited) Newton is usually the only unit for force, yes.What do you mean by "types of forces"?Technically speaking using a stapler would use electromagnetic force as the stapler and you are both slightly negative so when you push down you and the stapler repel and it is pushed "down"There is also the 4 fundamental forces:Strong/Weak Nuclear Force - Control subatomic stuff. Nuclei are held together by the strong force for example, it's very strong (relatively speaking here) and works on a VERY small distance. The weak force is behind all the radioactive decay and those smaller particles like mostly all the leptons (electrons, positrons, and neutrinos are the leptons you'll need to know later).Electromagnetic Force - It's the force behind...electromagnetic interactions...magnetism, electric fields/charges.Gravitational Force - It's gravity...yea... Edited February 12, 2012 by Drake Glau Reply Link to post Share on other sites More sharing options...
Chronofox Posted February 15, 2012 Report Share Posted February 15, 2012 I hate how Option G doesn't have any worked solutions on Tsokos' website. Here's one that's been bothering me:The index of refraction for blue light of wavelength 4.5 * 10-7 for a particular kind of glass is 1.328 and for red light of wavelength 6.5 * 10-7 it is 1.321. White light is incident on an equilateral triangular prism made of this glass parallel to one of its bases. What are the angles that the blue and red rays make with the normal as they emerge from the prism? Reply Link to post Share on other sites More sharing options...
DeBrogliez Posted February 18, 2012 Report Share Posted February 18, 2012 Hello,I don't if this has been asked before. So sorry if this question is repeated.In topic 10, are the heat engine and heat pump included?Because I can't find them in the syllabus, and the teacher didn't even mention them in class.But I was solving past papers the other day, and I saw a lot of questions about them.So where they included before, and now they are out of the syllabus?Also, what about the Carnot Cycle?Thank you Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted February 18, 2012 Report Share Posted February 18, 2012 Hello, I don't if this has been asked before. So sorry if this question is repeated. In topic 10, are the heat engine and heat pump included? Because I can't find them in the syllabus, and the teacher didn't even mention them in class. But I was solving past papers the other day, and I saw a lot of questions about them. So where they included before, and now they are out of the syllabus? Also, what about the Carnot Cycle? Thank you Ya halla be shbab el ordon To answer your question , if you check the 2009 physics syllabus you can find in Topic 10 and specifically 10.3 which is about second law of thermodynamics , to understand this rule you should understand how Heat engine and Heat pump work !! .. for the Carnot engine it's removed from the 2009 syllabus howver as our teacher say , " you will not loose anything if you understood it " Reply Link to post Share on other sites More sharing options...
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