For the mass m, attached to a spring, to move in a circle centripetal force and restoring force of the spring must be equal. Centripetal force is given with this formula:
Restoring force only occurs if the spring is stretched. If L is the length of unstretched spring we have the following formula for restoring force:
r is the length of a circle that mass m is traveling along.
As said above, these two forces have to be equal:
We solve for r:
r(w) will go to infinity when denominator is equal to zero:
Please keep in mind that Hooke's law has it's limitations, and before we reach our critial value of angular velocity spring will be strecthed to a point where Hooke's law does not aply anymore.
Answer:
Radiation waves (From the sun)
1.It gives less load on the shaft.
2.It transmits more power than belts.
3.It may be used for both long as well as short distance.
Radioactivity is a part of our earth - it has existed all along. Naturally occurring radioactive materials are present in its crust, the floors and walls of our homes, schools, or offices and in the food we eat and drink. There are radioactive gases in the air we breathe. Our own bodies - muscles, bones, and tissue - contain naturally occurring radioactive elements.