Posted by brain on Saturday, February 4, 2012 at 5:40pm.
1.A merrygoround makes one complete revo
lution in 12.2 s. A 49.4 kg child sits on the
horizontal floor of the merrygoround 2.3 m
from the center.
Find the childâ€™s acceleration. The accelera
tion of gravity is 9.8 m/s2 .
Answer in units of m/s2
2.Find the horizontal force of friction that acts
on the child.
Answer in units of N
3.What minimum coefficient of static friction is
necessary to keep the child from slipping?

physics  drwls, Saturday, February 4, 2012 at 8:39pm
1. Speed V = (2.3 m)*2 pi/12.2 s
= 1.185 nm/s
acceleration = V^2/R = 0.61 m/s^2
2. M*a = M V^2/R = ____ N
3. Ustat*M*g = M*V^2/R
Ustat = V^2/(g*R)