# Search results

1. ### 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. ### Virtual object

how is a virtual object identified ????
3. ### Concave mirror

how can we say that the image formed by a concave mirror is always real if object is virtual??? please help
4. ### 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
5. ### 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????
6. ### Soap bubble pressure

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

does gravity effect viscosity ? is viscosity independent od gravity ?
8. ### 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. ### 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. ### Bouyant force

if we take a liquid to agravity free space then is the bouyant force is 0 ?
11. ### 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. ### Young's modulous

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

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

if the earth stops rotating , what will happen to the apparent value of g on its surface ?
15. ### Acceleration is a vector

thanks Penn.6-5000 !!!!!!
16. ### 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. ### Pully and block

thanks cupid.callin !!
18. ### 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. ### 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. ### 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. ### 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. ### 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. ### Right handed system

thanks HallsofIvy !
24. ### 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. ### Cos inverse

thank everyone :)
26. ### 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. ### 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. ### Equation of circle

thanks Suk-Sci !!
29. ### 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. ### 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 ?