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 ...
i will re-phrase the question as :the accelerations of a particle 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.
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...
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...
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 !
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
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. "
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
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 ?
the given equations are :
1. x2 +y2 -4y-5 = 0
2. x2 +y2 + 12x +4y +31 = 0
3. x2 +y2 +6x +12y +36 = 0
the centres are (0,2) ; (-6,-2) ; (-3,-6) and radius of all is 3
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
no , i mean that if we put a very heavy box which rests compleatly on the weighing machine so that there is no exposed area at the bottomof the box where the force due to upward pressure could be exerted , sure the pressure will be exerted from the top , which will cause the weight to increase...
but if we consider a really big box which causes the water level to rise significantly , then i think that this will increase the pressure by (density*g*h) , pl. correct me if i am wrong or conform :)
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...
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 ??
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 ...
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 ?
you mean that the locus is y=-4 neglecting the term containing x , but why are we neglecting x ? i mean if we put different values of x we get different mid points , so why are we neglecting it??
pls. help , its getting over my head :((
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 ?
if we have same number of linearly independent homogenious equations as the number of variables , then how many solutions will we get apart from the trivial solution ?