chk out this site

just type disk brakes in the search box

 

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colleges

wt colleges

ans is d

take any point mass let say a

b and c will exert gravitational force on a . they will be = in magnitude= f

let the angle bw the 2 forces on a be  .than the resultant of both the f's is

3f...

similarly for b and c also the resultant gravitational force is 3f.inclined at angle 30 to each side

now all these forces meet at the centre of the triangle. now the the radius of rotation is R =r/ 3

so we get

mv²3/r = Gm3/r²

so v =Gm/r

 

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hey

since the body is rolling the point of contact will be at instaneous rest with respect to the surface.... so no motion tendency ... so no friction

as simple as it is

cheers

do rate if u find it useful

well the most interesting part has been

 rotational motion..... to analyse diff cases of rolling and the level of problems thus generated is simply mindcracking....but throughout this one dosent feel low rather u are spending ur brain....

cheers

 

plz suggest an authentic and reliable buk for organic chem

with a large variety of gud level ques

im following morrison and boyd but not finding it enough

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hey experts

im very confused regarding which buks should i consult .. for organic chemistry.

i am regularly following morrison n boyd but i m not finding it enough practice ques..

plz suggest an authentic and realiable book with a large variety of ques

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