Mass on spring rotates - what happens?

[ambroa]

hi,
what happens, when I hand on a spring a heavy object and then we'll rotate the spring? I've tried to write down some maths for it but I don't know anyway...

 

[PhanthomJay]

hi,
what happens, when I hand on a spring a heavy object and then we'll rotate the spring? I've tried to write down some maths for it but I don't know anyway...

It's the same as rotating the object hung on a rope: if swung in a horizontal circle at constant speed, v, the centripetal force is mv^2/r, which is the horizontal component of the spring force, and the verticlal force component of the spring force is the weight of the object. Once you calculate the resultant spring force, use Hooke's law to determimne its extension.