A big red yo-yo is going up and down at the end of a string.
The outer radius of the yo-yo is 1 m and its mass is 2 kg. The string is
wound around an inner "wheel" that has a certain radius. What is the radius
of that wheel? (string position is not drawn to scale) You will need to
find the tension in the string and the linear acceleration. Assume the
yo-yo is a solid disk. If you can find the angular acceleration of the
yo-yo, you should be able to determine the torque that the tension in the
string exerts. This in turn should allow you to determine the radius of
the inner "wheel."