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  1. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    b)i) 4 minutes (because this is when the difference between sight/sound is smallest) ii)Because the difference between hearing/seeing was never 0 seconds (because the scientists aren't dead is unfortunately not a correct answer. D:) iii) Speed = Distance/Time = 1200/3.6=333.33m/s iv) The...
  2. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    ALRIGHT THEN! *bang head against desk* TIME BASE The time base effects the frequency of the shown wave! If the time base is 1 second, then it will show the number of waves in 1 second! If time base is 0.5 seconds it will show the number of waves in 0.5 seconds! So the smaller the time base the...
  3. ThatReallyReallyWeirdDude

    Additional Mathematics ; post your doubts here!

    Title says it all If it's a past paper question, kindly link to it Good luck everyone.
  4. ThatReallyReallyWeirdDude

    Physics !!

    Uhh variant 1 I think, Sudan, 3pm tomorrow (that's in 19 hours 24 minutes ;)
  5. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Sorry but no :P I'm fine with answering questions but don't have time to do what you ask for. Sorry! A stream of beta particles is like current (it's a line of moving electrons in the end) So to know the change in direction you use fleming's left hand rule just remember that since the beta...
  6. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    It's not THAT much of a slight chance, seen it several times nad it's stated CLEARLY in the syllabus. I mean seriously, should honestly know this stuff by now :P
  7. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

  8. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Ugh send me past paper link and I'll make a diagram
  9. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    He said: specific heat capacity =E=mc*(temp change) latent heat of fusion/vapourization = E=M*L I think he meant:Specific heat capacity formula is : E=mc*temp change and that latent heat of fusion formula is: E=M*L Just bad use of equal signs is all
  10. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    If it's aqueous then oxygen and hydrogen. Sulfates are inert electrolytes.
  11. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Alright then When any object is falling the main thing acting on it will be the weight of the object, pulling it downwards. As per Newton's second law this will cause acceleration. When there's no air resistance the acceleration will be constant, as nothing is opposing it (this means the graph...
  12. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    ALright temperature rise of water is easy, 1.9*C The metal is added at 100*C (Question states it's taken from boiling water when it's at the same temp as water, so 100*C) It will have the same final temperature as the water so 100-22.9=77.1*C
  13. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    That makes sense Thanks :)
  14. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    I have a question too. The brightness of lamps and such...does it depend on current or voltage? I think it's current, because for example if you have a variable resistor and you up the resistance, the brightness decreases because the current decreases with voltage. Plus, current is the flow of...
  15. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    lol I made a diagram for that question for someone else. Sec I'll link it. http://www.xtremepapers.com/community/threads/please-help-physics-paper-3.16346/#post-279422
  16. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    That's Lenz's Law Example: If a magnet is pushed into a coil, north face first , it will induce a current in the coil. This current will move in a direction in such a way to oppose the thing that caused it; that is, the insertion of the magnet. In other words it will create a current so that the...
  17. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    I deserve a cookie for that...
  18. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Alright, here goes nothing! 3bii) The arm is in equilibrium thus not only are moments equal but upward forces are equal to downward forces. The total downward forces are 140N (20N+120N) and the total upward forces are 2130N - therefore for the forces to be equal there must be a downward force to...
  19. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Funnily enough I just explained this to a friend, let me copy it ;) i) When its light in the dark room, the resistance of the LDR will be low, so R and thus A will have a higher share of voltage and thus be 1 (high) When it's dark, the resistance of the LDR will be high, so R and A will have a...
  20. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Okay the work done/energy required for each rung is forcexdistance = 800x0.3 (cause it has to be meters, so 30cm=0.3m) =240J He climbs 20 rungs so total energy required = 20x240=4800 However he is only 15% efficient, so 4800J is only 15 PERCENT of the amount he uses so 15% times X = 4800 X =...
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