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Recent content by kishen1001

  1. K

    Physics: Post your doubts here!

    If you have learnt the chapter Superposition, you should know that S2X-S1X is the path difference. In this case, the signal decreases until X, so we assume at X, the amplitude is 0. This is called destructive interference. For this to happen, S2X-S1X must equal to n(lambda/2), where n=odd...
  2. K

    Physics: Post your doubts here!

    Work done in this case is area under the graph. Since they want the work done from 10mm to 20mm, the shape of the area under the graph is a trapezium, hence we use to formula for the area of a trapezium which is A=0.5*(a+b)*h. First we convert all the data into SI units since the answer is in...
  3. K

    Physics: Post your doubts here!

    In this case, the initial direction of motion is upwards, as shown in the graph. When it first reaches its highest point, its velocity is 0, which is at point B, after that it starts to move downwards, and when it reaches its lowest point, its velocity will be 0 again, thus the answer D
  4. K

    Physics: Post your doubts here!

    When you throw something upwards, gravity always acts downwards, so the acceleration is always -9.81ms^-1. It doesn't matter if it falling down again after that, if your initial direction is upwards, the acceleration will always be negative. This a very confusing concept to understand though.
  5. K

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s15_qp_13.pdf number (19) please
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