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its zero because no displacement of point of application of force(torque) and here point means point of contact whic just rolls and friction acts at other point then and also u can say no dissipative energy(heat here) and hence no work of friction (this is only for pure rolling)
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answer is in ur question itself na then where did the work go? is it vanished no it just went as potential energy of the system simple
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if u have hs then 220 can make it
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first solve total hc verma then it enough i mean abt concepts and the rest depends on u
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u mean if the body is slipping then t=i alpha will be 0 ar other number and it would be meaning less and if u r trying for equilibrium then for rotational forces(mean which cause rotation) frictional is the only one as per ur question and it is zero and so t=0 and also if body is slipping we cant apply t=ialpha and finally think we should not or rather cant apply
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then read them or else buy ncert
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try downloading ncert and try another buks lyk wat else u have
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go through ncert ull get all the doubts cleared
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first of all mechanics shoould be learnt because electricity is related to that and optics,nuclear physics and thermal physics complete hc verma then u can go for other buk but mechanics is must try reading hc verma and arihant
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think that lasr integration should have r also
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and another way is break rod into two parts at l and join them by thread this is hint try it now
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its like this let and element of dl choosen at l then its mass is m/l into dl.andwe know tension provides centripetal acceleration therefore t= m/l into dl x lsquared omega squared/l the limit of integration runs from o to l
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its not like two wood pieces donot attract each other but the force is very negligible every mass particle even two electrons attract each other but other ofrces dominate and u know the constant in gravitation na it makes the force such a small quantity hence two bodies(not heavenly) stay at rest
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transistion state is a high energy state where bond breaking and making occirs where as a reaction intermediate is a species which is produced in starting or any step of reaction and is consumed in other step
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pl v given in terms of g i root over 2gh. and final velocity is 2v using kinematics 4vsquared - 2gh= 2 g s ull get the required s
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u dnt get buks lyk arihant online but u can download halliday,university physics etc lyk buks if u google it
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