Homework Help: physics

Posted by Joey on Wednesday, January 5, 2011 at 9:32am.

A yo-yo has a rotational inertia of 860 g·cm2 and a mass of 150 g. Its axle radius is 3.4 mm, and its string is 90 cm long. The yo-yo rolls from rest down to the end of the string.
(a) What is the magnitude of its linear acceleration?
1 cm/s2

(b) How long does it take to reach the end of the string?
2 s

(c) As it reaches the end of the string, what is its linear speed?
3 cm/s

(d) As it reaches the end of the string, what is its translational kinetic energy?
4 J

(e) As it reaches the end of the string, what is its rotational kinetic energy?
5 J

(f) As it reaches the end of the string, what is its angular speed?
6 rad/s

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