# 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

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

if the earth stops rotating , what will happen to the apparent value of g on its surface ?
14. ### 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...
15. ### 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...
16. ### 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 !
17. ### 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
18. ### 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 !
19. ### 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
20. ### 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 ?
21. ### Equation of circle

Homework Statement if equation of 3 circles is given then find the equation of the smallest circle containing all 3 circles Homework Equations The Attempt at a Solution i can do this question for 2 circles , please give a hint for 3 circles
22. ### Weight in pool

if i place a weighing machine at the bottom of the swimming pool and then put a box on it whose density is greater than the iquid , then will it weigh more or less , as compared to on the land ? i think that it will weigh less , but if its lower surface is in contact with the surface of the...
23. ### Liquid pressure

if in a tank full of water big a wooden box floats on water then will the pressure below the box in the liquid be different from , the case , when there would be no wooden box ??
24. ### Force by tires divided ?

force by tires divided ???? suppose the mass of a car is m kg , the pressure in its tires is p Pa , so so balance the weight of the car the tires with contact area A will exert some force on the ground , will this force be = mg for all the tires , or will they divide the force among themselves...
25. ### Carry weight?

carry weight?? what does the amount of weight a person can carry depend upon ? i think that it depends upon person to person ?? is there any physical constraint like the weight of the man himself or any other factor ???
26. ### Determinant multiplication

is multiplication of determinant commutative ? if so , then is this correct: |A||B|=|B||A|=|AB|=|BA| ? then what does |AB|=|BA| imply ??
27. ### Locus of mid point

Homework Statement From the point (6,-8) all possible lines are drawn to cut x axis , find the locus of their middle ponts Homework Equations none The Attempt at a Solution i got the coordinates of the middle point as ((6+x)/2 ,-4 ) , but what will the locus be ?
28. ### Trapezium condition

what is the sufficient condition on a quadilateral to be a trapezium ?
29. ### Homogeneous linear equations geometrically

what does a homogeneous linear equation in 3 variables represent geometrically ?
30. ### Singular matrix

if a matrix is invertable can it be singular ?