Question

a particle of mass m is tied to a light string of length l and roated along a vertical circular pathh.What should be the minimum speed at the highest point of its path so that the string does not become slack at any position?

Answer 1

The centrifugal force, act upon mass, must be grater than weight at the top of the flight.

Answer 2

no but its options are as follows....\[a.\sqrt{2gl} \]\[b.\sqrt{gl}\]\[c.0\]\[d.\sqrt{gl/2} \]

Answer 3

so, \[\frac{ mv ^{2} }{ l } \ge mg\]

if the centrifugal force equals weight, then there is not any tension on the string..

you can take them as equal, but be careful what i mention above.

Answer 4

plss...cn u explain it with help of a suitable diagram

Answer 5

Centrifugal force - weight = tension