Centrip Force and Coef. of Friction

[Dunience]

Can someone help me on these problems?

Centrip Force prob.
A yoyo is whirled around in a circle over some yoyo’s head. The string will break if the force is greater than 10 N. If the mass of the yoyo is 200 g and the length of the string is 0.5 m, what is the maximum velocity of the yoyo?

The Coeffient/Centrip Force prob.
A car is going around a curve with a radius of 100 m. That is the maximum velocity of the car if the coefficient of friction is 0.5?

 

[maverick280857]

What have you done so far?

 

[marlon]

how about using $$F_{centripetal} = \frac{mv^2}{r}$$

marlon