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  1. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    oh okay now I get it, Thanks bro
  2. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    but isn't it that most permanent magnets are made from iron? and steel contains iron too.
  3. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    oh okay, thanx bro 27 A piece of iron and a piece of steel are picked up by an electromagnet as shown. N S steel iron The current to the electromagnet is switched off. What happens? A. Both the...
  4. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    Guys why red color can be seen from further distances than other colors, regarding its wavelength?
  5. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah I agree with u bro, I shall work as hard as I can, and I will get what I deserve to get. And don't care about others cheating, Allah is the fairest of all, and won't accept a hardworking people's work go for nothing. Allah will reward everyone with what he deserves, nothing more nothing less.
  6. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    okay :)
  7. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    since I dont have the paper, but the numbers are quite in this form, yeah it was around 10-9.
  8. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    yeah, but when my teacher marked the paper she marked is as wrong. :/ I was confused, asked her she told me that the first man traveled more distance while going slightly up, so the first guy does more work. But still I'm not convinced with my teacher's explanation, and feeling lost somehow in...
  9. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    hmmm but don't the person climbing the ladder use more force than the one walking along the slope?
  10. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    That the voltage across the terminals of a power source of electrical energy is 12V(like a battery). when fully charged.
  11. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    ur welcome In these types of circuits, it operates slightly different, IN the dark the LDR will have a high resistance and so the voltage at the junction will be high, making the transistor turn on, and so is the light. But when the resistance is low the voltage at the junction will be low...
  12. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    The LDR's resistance becomes high, making the voltage across the LDR bigger, which causes the transistor to switch on the lamp.
  13. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    wait, isn't it P= W/t , so less time= more power since Power and time are inversely proportional, right? I'm kinda lost right now :unsure:
  14. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah now I remember!, I answered the one climbing but it was wrong, then why its the guy walking on the slope that does more work?
  15. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    No values were given except the distances (Thats what I remember), I had this question on a past paper but I dont seem to find it.
  16. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    :eek: how in the world did u get it!? ps: I don't support cheating bro, u are not learning anything by doing this. ;):)
  17. R_Ma7mooD

    Physics, Chemistry and Biology: Post your doubts here!

    Guys can u help me with: One man walks along a 10 meters slope at a height of 3 meters. And another man walks straight forward for 8 meters then climbs a ladder at a height of 3 meters. Which man does more work and why?
  18. R_Ma7mooD

    PHYSICS! HELP NEEDED.

    Check these revision notes out, you'll find useful things and electrical circuits down. http://www.docdroid.net/cbu8/physics-igcse.pdf.html or you can watch this video I found it quite helpful: www.youtube.com/watch?v=agimlFmzdB4
  19. R_Ma7mooD

    PHYSICS DOUBTS

    Oh okay' I get it point' thanks for sharing :)
  20. R_Ma7mooD

    PHYSICS DOUBTS

    Yeah right, when waves go through less dense medium it slows down, making it bend. which should be toward the normal i guess. waves refract in the same way as light waves. When a wave is slowed down it bends towards the normal line and when it speeds up it bends away from the normal line. Thats...
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