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  1. P

    As temperature of a conductor increases why does the ratio of

    as temperature of a conductor increases why does the ratio of conductivity to resistivity increase ?????
  2. P

    Virtual object

    how is a virtual object identified ????
  3. P

    Concave mirror

    how can we say that the image formed by a concave mirror is always real if object is virtual??? please help
  4. P

    Confused with math identities

    Homework Statement what is the identity of a3 + b3 + c3 i am getting a bit confused please help!!!!! Homework Equations The Attempt at a Solution
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    What will happen to capillary rise effect if we take capillary to

    what will happen to capillary rise effect if we take capillary to space g=0????
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    Soap bubble pressure

    if air is pushed inside a soap bubble then why does the pressure decrease ????
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    Does gravity effect viscosity ?is viscosity independent od gravity ?

    does gravity effect viscosity ? is viscosity independent od gravity ?
  8. P

    Liquid pressure

    if water is flowing in a streamline motion then at 2 points at same horizontal level can the pressure be same if area is not same ?????? please help!!!!
  9. P

    What is the relation between surface tension and pressure ? are they

    what is the relation between surface tension and pressure ? are they same dimensionally? can they be equated?
  10. P

    Bouyant force

    if we take a liquid to agravity free space then is the bouyant force is 0 ?
  11. P

    Angular momentum

    if two circular discs of different radius and angular velocity are brought togather , they experience friction and finally there is no slipping between them , why is the total angular momentum not conserved in this case ? there is no eternal torque , friction is an internal force of the system...
  12. P

    Young's modulous

    thanks mapes ! but how will this give effective young's modulous ? i am a bit confused , please help !!!!!!
  13. P

    Young's modulous

    is there a formula to calculate the young modulous of a system like for resistances in series and parallel ????
  14. P

    Apparent g

    if the earth stops rotating , what will happen to the apparent value of g on its surface ?
  15. P

    Acceleration is a vector

    thanks Penn.6-5000 !!!!!!
  16. P

    Frames of reference

    i will re-phrase the question as :the accelerations of a partical as seen from 2 frames s1 ana s2 have equal magnitude =4 ; what can be possible the relationships between the accelerations of s1 and s2.
  17. P

    Pully and block

    thanks cupid.callin !!
  18. P

    Frames of reference

    Homework Statement the acceleration of a particle as seen from 2 frames s1 and s2 is 4 , what can be the value of acceleration between s1 and s2 Homework Equations The Attempt at a Solution the answer to this question is anything between 0 to 8 , but i do not know the reason , pl...
  19. P

    Pully and block

    Homework Statement http://img18.imageshack.us/img18/4880/questionf.png Uploaded with ImageShack.us Homework Equations if the 2 wires on both sides move with downward velocity u , with what velocity does the block rise , the angle with vertical is a ; The Attempt at a Solution...
  20. P

    Acceleration is a vector

    just got a bit confused : because acceleration is a vector , so can we define acceleration for speed , that is , if we say speed at t1 is a , t2 is b , then average acceleraion is (b-a)/(t2-t1) pl. help !
  21. P

    X->0 (sin[x])/x

    does lim x->0 (sin[x])/x exist ? if yes then what is it , iguess 0 , but cannot figure out the reason .. pl. help... note: [x] is greatest integer less than or equal to x
  22. P

    Right handed system

    hi g_edgar! how does this relate to the previous rule :"If A, B, and C are at right angles to one another, and have length 1, then that specific order, A, B, C, is a "right hand system" if and only if A x B= C, B x C= A, and C x A= B. "
  23. P

    Right handed system

    thanks HallsofIvy !
  24. P

    Right handed system

    if we say that A , B and C form a right handed system , where all 3 are vectors then does it mean that A X B = C or C X A = B ?? pl. help !
  25. P

    Cos inverse

    thank everyone :)
  26. P

    Cos inverse

    Homework Statement is it possible that cos((cos-1(2x-1))/2)) could be written only in terms of x , i mean by eliminating cos ans cos-1 ? Homework Equations The Attempt at a Solution Homework Statement Homework Equations The Attempt at a Solution
  27. P

    Is x/(1+e^(1/x)) differentiable at x=0

    i guess by x you mean 1/h , but when 1/h goes to -infinity , e1/h goes to 0 , this means the last expression 1/(1+e1/h) becomes 1 and yes f(0)=0
  28. P

    Equation of circle

    thanks Suk-Sci !!
  29. P

    Is x/(1+e^(1/x)) differentiable at x=0

    my book says that i am wrong , but i think iam convinced that i am right , thanks!!
  30. P

    Is x/(1+e^(1/x)) differentiable at x=0

    Homework Statement is x/(1+e1/x) differentiable at x =0 Homework Equations The Attempt at a Solution i calculated the right and left hand derivative and got them as 0 and 1 respectively , so it should not be differentiable, is it right my book says that it is differentiable ?
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