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  1. E

    Physics: Post your doubts here!

    Δp = p2 - p Rearranging gives: Δp + p1 = p2 We know from the diagram the angle between p1 and p2. The vector diagram: You can use Pythagoras's theorem to find Δp.
  2. E

    Physics: Post your doubts here!

    Magnets and springs
  3. E

    Mathematics: Post your doubts here!

    g(x) is the "inside" function meaning its range is now the input of f(x). Since g(x) range is >6 then the input to f(x) will be >6. Substitute this in f(x) and you get that the composite function must be greater than 4. Make a sketch for this to make sense.
  4. E

    Mathematics: Post your doubts here!

    g(x)'s lowest value will be at the highest x value in its domain 4. And since the domain doesn't include 4(greater than only not greater than or equal to) then g(x) will be only be greater than this value.) substitute x=4 in g(x) to get 6. You have to sketch the graph to really understand...
  5. E

    Mathematics: Post your doubts here!

    Got it from a friend, I don't have the other papers. Don't think they're out yet.
  6. E

    Mathematics: Post your doubts here!

    Here's my final answers if someone wants to cross check
  7. E

    Mathematics: Post your doubts here!

  8. E

    Mathematics: Post your doubts here!

    Sorry didn't know how to
  9. E

    Mathematics: Post your doubts here!

    Ah okay, so you would write this as: range of f(x) is outside the domain of g(x) I guess. Thanks.
  10. E

    Mathematics: Post your doubts here!

    No mark scheme out yet, check your conversations.
  11. E

    Mathematics: Post your doubts here!

    march 18
  12. E

    Mathematics: Post your doubts here!

    can someone explain 10(ii)?
  13. E

    Mathematics: Post your doubts here!

    Since CD lies in the same line as BC then it must be an integer multiple of the unit vector of BC (The integer will be the magnitude of CD). In this case we don't know if CD is in the same direction as BC or the opposite, so it can either be a positive or a negative integer multiple of the unit...
  14. E

    Physics: Post your doubts here!

    s09/11 How do we solve this? I tried this Torque by the cord = Torque by F on the spindle (900)(0.4) = F(1.2) But that gives C, answer is B
  15. E

    Physics: Post your doubts here!

    36) Applying KVL around the circuit gives 2E = IR + Ir1 + Ir2 Since the voltmeter reading zero this means there is no voltage difference between its contacts points which gives Vrise=Vdrop E = Ir1 Substituting this into the first equation gives 2Ir1 = IR + Ir1+ Ir2 R = r1 - r2 (B) 37)...
  16. E

    Physics: Post your doubts here!

    oct nov 2017 13 any help would be appreciated
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