EASY PROBLEM - Force to break the string.

[8parks11]

A .208-kg toy whistle can be whirled in a horizontal circle of 1.00 m radius at a maximum of 3.00 rev/s b4 the string breaks. What is the force needed to break the string.

I don't know how to start this problem but this is what i got.

first i found frequency which is 1/3
and then i got omega = 2pi 1/3

i think this is all wrong because the answer is 73.9N

someone please help!

 

[8parks11]

ook i read the problem wrong so it should be
f=mac
and then f=mv^2/r
so iget 0.208 x v^2 / 1
now how do i get v from the maximum revolution

 

[8parks11]

ok i got one revolution is 2pi (obviously)
how do i implement that tothe problem to solve it.

 

[lotrgreengrapes7926]

If 1 rotation is 2pi, how far does it travel in 1 second? This is the velocity.

 

[8parks11]

ok now i got everything I am screwing up with this ti-89
i did 6pi^2 which obviously registered as pi^2 x 6
thanks

 

[8parks11]

ok now i got everything I am screwing up with this ti-89
i did 6pi^2 which obviously registered as pi^2 x 6
thanks