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  1. Suchal Riaz

    Physics: Post your doubts here!

    energy is directly proportional to square of extension. if E is half, then extension is 1/√2 of max extension = 2.6/√2 = 1.84
  2. Suchal Riaz

    Physics: Post your doubts here!

    please explain him that question in which i tagged you then i will answer your doubt.
  3. Suchal Riaz

    Physics: Post your doubts here!

    avoid using abusive words such as fag again. if you solved and he didn't get then it doesn't mean you will get rude to him. and the way you explained no one would get it. read the terms and rules of this forum: https://www.xtremepapers.com/community/help/terms
  4. Suchal Riaz

    Physics: Post your doubts here!

    the laser is normal to a slit and that difracted light goes to screen. right click that image and open it in new tab because the image is rotated in this website.
  5. Suchal Riaz

    Physics: Post your doubts here!

    correct. but i drew it to make it easy for you to understand. i always use cosine rule or Pythagoras theorem unless examiner himself says to draw scale drawing. i also said at the end to use cosine rule. that diagram was for concept.
  6. Suchal Riaz

    Physics: Post your doubts here!

    c Change in U = mgh = 2.8N * 0.015 m = 0.057J change in e.pe = e.p.e in 16.3 cm extension - e.p.e in 17.8 extension =1/2k(e1²-e2²) the k we found was in N/cm not in N/m we we will convert it. we get k=180N/M 1/2 * 180 * (0.036²-0.021²)=0.077J
  7. Suchal Riaz

    Physics: Post your doubts here!

    new wave will be straight line. Haya Ahmed please give him the pictures and animation which i gave you yesterday and explain it to him how i explained it to you. i have to solve many other doubts.
  8. Suchal Riaz

    Physics: Post your doubts here!

    yes
  9. Suchal Riaz

    Physics: Post your doubts here!

    acceleration = gsin15 AB = 0.26/sin15=1.0 s=ut + 1/2 at² as u=0, s=1/2 at² √(2s/a)=t t= √( ( 2*1 )/ gsin15) = 0.89s
  10. Suchal Riaz

    Physics: Post your doubts here!

    kitkat <3 :P Please solve them simultaneously i have to solve other doubts
  11. Suchal Riaz

    Physics: Post your doubts here!

    now use the cosine rule. angle is 90+45. scale drawing will not give accurate result because the velocity of wind gives 1.8cm only if i took 1 cm = 20 m/s
  12. Suchal Riaz

    Physics: Post your doubts here!

    Here you need to draw labelled diagram of source of light, apparatus to diffract/interfere and how to observe it. To observe the diffraction the light must be perpendicular to the slit and the screen must be long distance from slit to observe. we will decrease slit separation(in (ii) ) and slit...
  13. Suchal Riaz

    Physics: Post your doubts here!

    we are required to find resultant velocity(not force) which is found be adding velocities, like we add other vectors, through triangle rule, head-to-tail rule or parallelogram rule. head to tail is easiest. you write a scale like 20cm = 1m/s so the diagram fits into the given space. do you want...
  14. Suchal Riaz

    Physics: Post your doubts here!

    in the post you qouted i said i haven't done winter 13 papers. i will answer your question when i have myself done that paper. and for now i am solving other queries before resuming my practice. so please wait about an hour.
  15. Suchal Riaz

    Physics: Post your doubts here!

    actually we write specks of light because the particles themselves are not visible. we can't figure out their shape or anything but only small specks of light so we know their location only.
  16. Suchal Riaz

    your second question is not in the link given. first question asnwered.

    your second question is not in the link given. first question asnwered.
  17. Suchal Riaz

    Physics: Post your doubts here!

    Snow Angel question number 4 (b) (iv) current = 0.24 A (a) p.d = IR = 0.24*5.5=1.32V (b) terminal p.d = emf - lost volts = 4.4 V - (0.24 A * 2.3 ohm) = 0.552 V (c) terminal p.d = emf - lost volts = 2.1 V - (1.8 ohm * 0.24 A) = 1.67 V
  18. Suchal Riaz

    Physics: Post your doubts here!

    From now i am available for answering any physics questions. My revision is almost complete except w13 paper. Thought blocker
  19. Suchal Riaz

    Physics: Post your doubts here!

    no. when in parallel to LDR the p.d = 20 when in series with ldr the p.d <20 as p.d of both LDR+R2 = 20
  20. Suchal Riaz

    Physics: Post your doubts here!

    you attached the wrong paper.
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