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# need confirmation in arihant mec vol 2(d c pandey) ,rotational dynamics ,example 9.19,in explanation part 9.10)torque eqs applied(i.e f cross R) are incorrect right eg 9.19  the question is  two masses m1,m2 are connected by massless sting over a solid cylinder(no thread slipping and no axle friction is absent) if m1(left side block ) and t1 is tension in left side part of string,m2(rigt block) t2 is tension in right part of string the eqs given in book are  t1-m1g=m1a m2g-t2=m2a (t2-t1)r=.5mr^2(a/r)(torque eq given in text) r is radius of cylinder and m is mass of cylinder

148 Points
11 years ago

Dear akash kashyp

Torge should be r X F .

all the given equation are correct.

in which equation  you have doubt  ,clearly post it here.

Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.

All the best.

Regards,

akash kashyp
8 Points
11 years ago
in the torque equation torque due to t1 is clockwise and outwards the plane and torque due to t2 is anticlockwise is it not