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  1. J

    Physics: Post your doubts here!

    3b(i)(ii) Now since the question introduces u with newtons third law of motion,u should realise in (i) it is asking u the same thing.So FA=-FB cuz these forces act in opposite directions.This is simple really.Now for second part it just requires u to understand that these spheres collide with...
  2. J

    Physics: Post your doubts here!

    In Q 18 why do we subtract the pressures shouldnt we add them??
  3. J

    Physics: Post your doubts here!

    For Q37 if u say the resistance of one wire is 6R then wont total resistance be 6R *6 cuz there are 6 wires in Q?
  4. J

    Physics: Post your doubts here!

    In Q18 why cant D be correct? Q)23 In Q27 why cant B be correct? Q37 Q40
  5. J

    Physics: Post your doubts here!

    ur welcome
  6. J

    Physics: Post your doubts here!

    For 7b(iii) When temperature rises its resistance decreases so p.d across thermistor also decreases.Lets say the p.d across it is now 2.0 V,previously it was 2.7 V.Now in the previous part to find length of wire between M and Q u did the following step: L=2.7 *100/4.5.Now in place of 2.7 put 2.0...
  7. J

    Physics: Post your doubts here!

    For 5(c) ii In order to find resultant intensity u will have to find resultant amplitude.So Amplitude of A-amplitude of B=3-2=1 Now u can use either Intensity of A i.e I or intensity of B i.e 4/9I to find resultant intensity. 6a: Since potential of plates is unknown u have to assume Y is...
  8. J

    Physics: Post your doubts here!

    thnx bro
  9. J

    Physics: Post your doubts here!

    In Q 15 why arent B and C correct,in Q30 why isnt B correct,in Q36 why cant A be correct and Q 39?
  10. J

    Physics: Post your doubts here!

    I dont understand what expression u have used,i mean u have divided speed of light with wavelength??
  11. J

    Physics: Post your doubts here!

    Q 1 why is the answer C,it should be B?
  12. J

    Physics: Post your doubts here!

    U r a offcialy a genius,Thnx ur explanation was brilliant.Love u bro
  13. J

    Physics: Post your doubts here!

    OK but why wont we consider it when sand is added?Shouldnt the speed be constant then?
  14. J

    Physics: Post your doubts here!

    I dont understand why speed will remain constant when sand is removed???
  15. J

    Physics: Post your doubts here!

    Q 10 and Q31 with proper explanation.
  16. J

    Physics: Post your doubts here!

    For q15 if u have done A level M1 then it will be no problem however this is the solution: Gain in Kinetic Energy= 1/2 x 2.0 x(v^2 -0) =v^2 Loss in Potential Energy= 2.0 x 9.81 x 3=58.86 J Work done against friction= 7.0 x 5.0=35 J Loss in potential...
  17. J

    Physics: Post your doubts here!

    Q 10 and Q31 with proper explanation.
  18. J

    Physics: Post your doubts here!

    Q 24 of p1 May June 2008 and Q18 of may june 2009 with proper explanation.
  19. J

    A level Biology: Post your doubts here!

    So we will discard 10cm3 from last beaker?
  20. J

    A level Biology: Post your doubts here!

    Wouldn't this make the last beaker with 20 cm3 while the others are all 10 cm3
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