Recent content by govinda

(i)appreciate the effort, infact i would have saved a lot of time if some1 had explained when momentum is conserved ... why it is conserved . the relationship between momentum conservation ,centre of mass Newtons thrird law and impulses . also solve a few probelms ab initio for example some...

there's a standard question about the spinning dancer who pulls her hands inward reducing her moment of inertia and increasing her ang. velocity . it seems she had to do some work against the centrifugal force (from momentum and energy equations) i thought of a simpler example to check if the...

as u go further away from the Earth surface the gravitaional force will continously reduce .so even if u were to ignore the intial extra force applied there would still be an accelleration whose rate would increase the further u went from the earth

zooby , im sorry still don't understand what's going on with the muscle care 2 elucidate?

integral , i had the same doubt zooby had about the frequency being generally high and therefore not giving u enough time to remove ur hand . isn't it more realistic to consider the average over half a cycle (.707 times the maximum) for each direction? also i didnt quite understand what u...

dave, why is ac safer than dc?

krab. is there any formal proof on the conservation of angular momentum ... if so is it complete in itself or based on conservation of energy?

i think the bend will be very small on an atomic level for the same reasons that whoozum attributed but i doubt whether there will be ossilation if the force is constant . if the force is instantaneous then i guess there will be oscillation since elastic forces(?) caused the deformation of the...

lurch , if you consider the gases from the rocket to be light which i suppose they are their masses can be neglected ,then the coordinates of the projectile can be found with some accuracy . regarding the glass ,suppose the cup broke into 4 pieces 3 of which are at the corners of a square...

fred, by validated i meant that the theory of frictional force acting inward was validated which i had a problem with accepting initially ...

nice explanation quasar .. so friction acts linearly .. friction while negotiating the turn can be ignored when the angle is small as the polygon approaches a circle ... also as the turn becomes less the friction opposing linear motion does infact become radially inward (look at the pic and...

heres another conceptual one . there is a standard yet very elegant problem about a rocket bllowing up mid air and finding the final postions of the parts of the projectile using the principle of centre of mass remaining the same since the forces a re internal when the rocket blows up . now...

hi guys . i read that friction can be attributed to the centripetal force that causes circular motion . now suppose we consider our circle as a polygon , say an octagon and a bike or car was going along one of the sides of this octagon if i were to negotiate a turn of an angle of 45 degrees...