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  1. hellodjfos;s'ff

    Physics: Post your doubts here!

    So you draw a vector diagram for this question. You connect the tail of one of the vectors to the head of the other vector, and connect the tail of the first vector to the head of the 2nd to get the resultant. I have shown this in the attachment. You will realize that the angle between the two...
  2. hellodjfos;s'ff

    Physics: Post your doubts here!

    If anyone can post the paper 22 or give me all the questions from it, I can give solid predictions on what would come up as the topics from which questions are chosen are often interlinked for paper 1, 2 and 5.
  3. hellodjfos;s'ff

    Physics: Post your doubts here!

    This question is not found difficult just by me, but by everyone! Haha.
  4. hellodjfos;s'ff

    Physics: Post your doubts here!

    Oh yeah sorry, the force should be acting horizontally, not vertically, but it still produces an anticlockwise moment. That doesn't change any of the calculations. I've attached a corrected file showing where the 90N force would be acting.
  5. hellodjfos;s'ff

    Physics: Post your doubts here!

    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 situation, the balloon is going down so the air resistance(AR) and upthrust(UT) are acting...
  6. hellodjfos;s'ff

    Physics: Post your doubts here!

    I'll do 14 first since it's easier. Take the axle as your pivot in this question. Now the issue with this question is that people don't understand where the 90N force is acting. I have attached a file to show where it's acting. The reason it's acting there is bc to move the vehicle forwards...
  7. hellodjfos;s'ff

    Chemistry and Physics AS paper 12 MCQS

    If anyone's got tough physics mcq questions, please send them!
  8. hellodjfos;s'ff

    Physics: Post your doubts here!

    When quantities are being added or subtracted, you always add the absolute uncertainties. You get an absolute uncertainty of 0.03 m in (P-Q). Then apply (absolute uncertainty/value)*100. You get 6.8% which rounds to 7%, hence the answer being D.
  9. hellodjfos;s'ff

    Looking for 9792 Physics papers for 2015 and 2016

    9792 is another CIE subject. It's called Pre-U Physics... it's a lot harder than GCE A-levels Physics.
  10. hellodjfos;s'ff

    Physics: Post your doubts here!

    I am not, I am looking to apply to US. People keep saying that to me, but those expectation are too high bro
  11. hellodjfos;s'ff

    Physics: Post your doubts here!

    I'll do the march 18 paper 1 in a couple of days, so I will reply to those questions in a couple of days bro.
  12. hellodjfos;s'ff

    Physics: Post your doubts here!

    I don't know why you would divide 12 by 2... the answer was surely 12. If you divide the answer by 2, it gives you the time taken for the wave to go from an antinode to a node. I am certain it's 12s, because I contacted my teacher about that question.
  13. hellodjfos;s'ff

    Physics: Post your doubts here!

    Don't remember my answers from the paper. I think the output power was higher. And yes energy dissipated is work done against internal resistance.
  14. hellodjfos;s'ff

    Physics: Post your doubts here!

    The uncertainty of the micrometer is written on the micrometer itself, it is usually 0.01 mm, but again different micrometers have different uncertainties.
  15. hellodjfos;s'ff

    Physics: Post your doubts here!

    Yeah 2 degrees is the minimum
  16. hellodjfos;s'ff

    Physics: Post your doubts here!

    No, you get the manual ones.
  17. hellodjfos;s'ff

    Physics: Post your doubts here!

    You can say it is/it isn't within limits of experimental accuracy, as long as you explain your answer, you would get the mark. Your explanation should relate to the percentage uncertainty of a measured value you found in the previous parts(as you mentioned).
  18. hellodjfos;s'ff

    Physics: Post your doubts here!

    You use a specified criteria like: if the constants have a percentage difference of 20%, they are within limits of experimental accuracy. The criteria you specify is upto you.
  19. hellodjfos;s'ff

    Physics: Post your doubts here!

    You can see both the areas are equal... So the elastic potential energy was same when the spring went from 0 to e and e to 0. So... none of the elastic energy is converted into heat... so A can't be correct since there isn't any energy converted into heat. You can explain this ans more than this.
  20. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    You can find it on your statement of results.
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