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  1. hellodjfos;s'ff

    Physics: Post your doubts here!

    Yeah the answer is C. Just apply kirchhoff's 2nd law
  2. hellodjfos;s'ff

    Physics: Post your doubts here!

    Diffraction grating maxima are more spread because there are so many slits in grating than double slit, so more diffraction takes in grating hence creating more widely spread maxima. D grating maxima are sharper because again, there are so many slits in grating compared to the two in double...
  3. hellodjfos;s'ff

    Physics: Post your doubts here!

    It's D
  4. hellodjfos;s'ff

    Physics: Post your doubts here!

    These are two very tough questions if you wanna practice.
  5. hellodjfos;s'ff

    Physics: Post your doubts here!

    Welcome
  6. hellodjfos;s'ff

    Physics: Post your doubts here!

    I answered this a couple of days ago, so just gonna copy paste my previous explanation: 8 is a slightly tougher question. Throughout this question, the balloon is moving at a constant speed meaning the balloon is in equilibrium so upwards forces must be equal to downward forces. In the first...
  7. hellodjfos;s'ff

    Physics: Post your doubts here!

    Width of slits don't effect anything in the double slit formula. Width of the slits only impacts the intensity of the wave/fringes.
  8. hellodjfos;s'ff

    Physics: Post your doubts here!

    The increase in current suggests that the total resistance of the circuit increased(R=V/I). Now the only way the resistance can increase is through the variable resistor. So the resistance of the variable resistor was increased, and you can determine how much pd it takes up using the potential...
  9. hellodjfos;s'ff

    Physics: Post your doubts here!

    Yup, answer is D because x=lamda(D)/a. So fringe separation is proportional to the lamda, so if you use a greater wavelength, you get greater fringe separation.
  10. hellodjfos;s'ff

    Physics: Post your doubts here!

    It's C. The question is really weird
  11. hellodjfos;s'ff

    Physics: Post your doubts here!

    So they want the destination to be north of the bird's current location meaning that the resultant velocity must be vertically upwards. You draw a vector triangle based on the info that the resultant is directly upwards and the wind is blowing from the east. Then you use sin, cos or tan to find...
  12. hellodjfos;s'ff

    Physics: Post your doubts here!

    This question makes no sense. Can someone solve it?
  13. hellodjfos;s'ff

    Physics: Post your doubts here!

    That is true, but power is a scalar quantity so the direction of the force or velocity don't matter.
  14. hellodjfos;s'ff

    Physics: Post your doubts here!

    The force in P=Fv is meant to be the resultant force. In this question, there is no mention of other forces so we take the resultant force as 180N.
  15. hellodjfos;s'ff

    Physics: Post your doubts here!

    C
  16. hellodjfos;s'ff

    Physics: Post your doubts here!

    The explanation given in the picture is difficult to understand. What I would do is, I would assume that the graph is a triangle(for approximation). So the area of the triangle ends up being 0.1 J. Now as I have shown in the attached file, there is a small area that is being left out when we...
  17. hellodjfos;s'ff

    Physics: Post your doubts here!

    Be careful, the question says maximum and minimum PRESSURE
  18. hellodjfos;s'ff

    Physics: Post your doubts here!

    23: maximum pressure point is compression while minimum pressure point is rarefaction. The distance between rarefaction and compression is half the wavelength. Using v=flamda, find the wavelength and divide it by 2 to get the distance between rarefaction and compression. Wavelength will turn out...
  19. hellodjfos;s'ff

    Physics: Post your doubts here!

    If anyone's got last minute questions, do send
  20. hellodjfos;s'ff

    Physics: Post your doubts here!

    Answered it above
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