3b
AN EQUILATERAL TRIANGLE abc formed from auniform wire has two small identical beads initially located at A. THE TRIANGLE IS SET ROTATING about the vertical axis AO. then the beads are realsed from rest simultaneously and allowed to slide down, one along AB and the other along AC. neglecting frictional, which of the following will be conserved as body slides down....
(a) angular veolcity & total energy
(b)total angular momentum & total energy
(c) angular veolcity & moment of inertia
(d) total angular momentum & moment of inertia
ASKED IN JEE
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12 Answers
1the torque acting is zero ...that implies angular momentum is conserved and enrgy is always conserved !
1hmm yup ...even the energy is conserved....n the moment of inertia is changing...hence angular velocity varies !
1
now consider points 1 & 2, at both position beads will rotate by equal amount in equal interval of time & also the angular velocity of bead will be equal to that of rod.,,, so it is constant.........
pls correct me if i m wrong
1to fir angular velocity of bead bhi to constant hogi, to option (a) kyu nai ho sakta
1bhaio maaf karo ...
i mean to say the moment of inertia is changing so is angular velocity !
33no torque so ang momentum is conserved....
Total energy is conserved if we consider force by Earth in potential energy...not work done(which is always considered as potential energy...)
moment of inertia changes... so does ω but their ptoduct does not changes...