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  1. hellodjfos;s'ff

    Physics: Post your doubts here!

    You should try to send the whole question... I would use the definition of the 1st law of thermodynamics here. Since the gas is expanding and pushing onto the piston, first of all energy is being supplied to the system(positive q) and work is being done BY THE SYSTEM to push the piston(negative...
  2. hellodjfos;s'ff

    Physics: Post your doubts here!

    Total energy: decreases - because resistive forces act on the sat Radius: decreases - if total energy decreases, radius would decrease Potential energy: decreases - since radius decreases Kinetic energy: increases - since radius is inverse to kinetic energy in formula, kinetic energy increase as...
  3. hellodjfos;s'ff

    Physics: Post your doubts here!

    The question is related to part (a)... i cant see it. Send the whole question.
  4. hellodjfos;s'ff

    Physics: Post your doubts here!

    Whenever they ask for a use of an amplifier circuit, answer with 'variable voltmeter'. This answer works in most cases.
  5. hellodjfos;s'ff

    Physics: Post your doubts here!

    This is fairly simple... So first of all, the current passing through the ammeter is 4.5 microammeter and using Q=It, we can determine that the charge flowing through the ammeter is 4.5 microcoloumb in 1 second. As the switch changes positions from X to Y 50 times in one second, the charge...
  6. hellodjfos;s'ff

    Physics: Post your doubts here!

    Setting up circuits for electricity is something I cannot help you with; problems in performing the experiment can only be fixed through practice. The only thing you can prepare for in P3 right before the exam is memorising the bullet-points for the last part of question 2. I would advise you to...
  7. hellodjfos;s'ff

    Physics: Post your doubts here!

    Raw readings are taken as it is for example, readings for time can be taken according to your stopwatch/timer reading - time readings are usually upto 1 or 2 decimal places(preferably 1 decimal place). As for calculations in table, the answer/readings must be rounded to the same number of...
  8. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Σ(x) would be the sum of all values in a data set. Σ(x-a) would mean that a is subtracted from every value in the data set for example I have a data set of 70 80 90 100... the Σ(x) is 340 but Σ(x-10) would be 10 subtracted from every value. We could manually calculate this but that would be very...
  9. hellodjfos;s'ff

    Physics: Post your doubts here!

    The question asks for the time between the minimum and maximum frequency which would be 0.5period of the information signal. The information signal has a frequency of 10kHz so this is the frequency at which the wave operates. Use f=1/T to find the period and half that to get the time.
  10. hellodjfos;s'ff

    Physics: Post your doubts here!

    This would be my official answer to c: Decay constant is probability of decay per unit time. Since E has a smaller decay constant, it is less likely to decay into F and since F has a larger decay constant it is more likely to decay into G. Hence, the amount of F is always small as the rate of...
  11. hellodjfos;s'ff

    Physics: Post your doubts here!

    So P has to be that curve since P is the first nuclide that begins decaying so it must have existing amount hence it has a non-zero y intercept. D has to be the curve with an increase and decrease because at first when P decays, the rate of formation of D is high so there are lots of D nuclide...
  12. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Use trigonometry... draw a triangle AOD(with the perpendicular) and find the length of all sides. You have vectors AO, OD and can find AD. Find the magnitude of these vectors(they will be the lengths of the sides of the triangle). Now find an angle AOD or ADO and use the angle to find the...
  13. hellodjfos;s'ff

    Physics: Post your doubts here!

    Star A Rock Zero GPE point Star B I'll assume that above are the positions of the objects. So Between Star A and zero GPE point, the star A is trying to pull the rock towards itself so the rock must have...
  14. hellodjfos;s'ff

    Physics: Post your doubts here!

    You have either posted the wrong link or posted in the wrong thread. Edit: Regardless of that, I assume you are asking about s16 qp41 q1b(ii) - physics. If that's the case, in part b(ii) we are trying to find the minimum speed required for the rock to reach star B, so the rock must reach the...
  15. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Don't you have the unsolved physics p4? Also what about physics p5?
  16. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Need maths p3 and p6 and physics p4 and p5.
  17. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    To find standard deviation, you need the value of either Σx and Σx^2 or Σ(x-50) and Σ(x-50)^2. Since we only have the latter, we have to solve the question using them. We found Σ(x-50) and Σ(x-50)^2 in the first part... these coded total represents the value of Σx-50 which means that every data...
  18. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    -5+2i would be in the 2nd quadrant so the argument would be pi/2+tan-¹(5/2)
  19. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Yes they're the same. You can even put the values in your calculator and clarify that.
  20. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    -tan-¹(1/3) and tan-¹(-1/3) are the same so tan-¹(1/3)-tan-¹(-1/3) becomes tan-¹(1/3)+tan-¹(1/3) hence 2tan-¹(1/3)
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