http://www.ck12.org Chapter 9. Rotational Motion
a. Who wins?
b. By how much? That is, what is the net torque?
c. Assume that the merry-go-round is weighted down with a large pile of steel plates. It is so massive that
it has a moment of inertia of 2000 kg·m^2. What is its angular acceleration?
d. How long will it take the merry-go-round to spin around once completely?- A spherical Yo-Yo is given to you for Christmas. Being the good physicist that you are, you immediately
calculate it’s acceleration and then test it with a motion detector. The Yo-Yo, of mass of 200g and a radius of
10cm. is a solid sphere (I = 2/5MR2), with two strings attached, both at a 20° from the top. See figure. The
string thickness is negligible compared to the Sphere radius.