am i correct --------

firstly the friction acts upward along the plane.

there is no linear motion during its reverse spin     since,         friction (upward along the plane)  =

mgsin@ = downward force along the plane = mgsin@ ). -------------------------( 1 )

when  angular velocity becomes zero, the friction which is acting upward along the plane reduces in magnitude

so that the cylinder starts coming downward. i.e, if  friction is still  mgsin@ ( maximum friction ) then from ( 1 ) it 

can not  move downward ( since the forces are equal in magnitude and opposite in direction).

this is what i have undersood.        please i want to confirm weather i am correct  or not...........

in which direction does it move .

A cylinder of radius R is spinned and then placed  on an incline having coefficient of friction u = tan@ ( @is the

angle of incline). The cylinder contiues to spin without faling for time

a) rw / 3gsin@

b) rw / 2gsin@

c) rw / gsin@

d) 2rw / gsin@

even if it is f-T=MA  u wiill not get the answer. first  u try it and then give the reply completely.......

any experts please answer to my question. i am  not getting it.................

i am waiting only for the complete solution.................and not anything else......................

hey varun,

i solved this using ur equations but i am not getting the answer.

once u try urself,,,,

i didnot understand the first equation    f+T=MA,

becos for the right disc which is rotating with an  angular velocity w ,  the friction acts in the forward direction(i.e, rightward)  and the tension is acting along the string (leftward)......and  hence the equation comes to be

         f - T= MA

after both the discs start rolling ,          what  is their final linear and angular  velocity.

ans:       angular velocity:   w / 6 ,      

               linear velocity   :  w R / 6 .

any experts ...........please give the solution  ..... .... ............  i am waiting  !!!!!!!!

the front disc is given an initial angular velocity w.

this question is from arihant..............................................

i am  waiting for the reply..........................any one please...........................................                  

the assembly of two discs as shown  in figure is placed on a rough horizontal surface and the front disc is given an initial angular velocity ' w '. determine the final linear and angular velcity when both the discs start rolling, it is given that friction is sufficeient to sustain rolling in the rear wheel from the starting of motion.

thank you elessar..............thank u very much....................

as i am new to goiit      i dont know how to rate you.

thanx goiitians............at last i didnot get the answer.......................

thank you very much............goiitians.............at last i didnot get the answer.

i think its just a waste of time .........     yaar............

hey goiitians whats this ?         i am waiting for the solution from 2 days .         why no one helping me? try the

problem once. its from arihanth actually.

the answer is 2.25 sec.                     i want the solution.

why no body is ready?