What do I do for these problems ?

[whataboutbob]

What do I do for these problems!?

Homework Statement

1.A merry-go-round makes one complete revo-
lution in 12.2 s. A 49.4 kg child sits on the
horizontal floor of the merry-go-round 2.3 m
from the center.
Find the child’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?

Homework Equations

f=M*A
a=(Tangential speed)^6/r
Tangential speed=2pi r/time

The Attempt at a Solution

Don't know how to get acceleration

 

[cepheid]

Welcome to PF,

Homework Statement

1.A merry-go-round makes one complete revo-
lution in 12.2 s. A 49.4 kg child sits on the
horizontal floor of the merry-go-round 2.3 m
from the center.
Find the child’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?

Homework Equations

The Attempt at a Solution

If the child moves in a CIRCLE at a constant speed, then what MUST be true about the child's acceleration? In other words, what kind of acceleration must he/she be experiencing? How do you go about computing this type of acceleration?

 

[whataboutbob]

Is it the centrapical Acceleration?

 

[whataboutbob]

Help?

 

[cepheid]

Is it the centrapical Acceleration?

Yeah, it's the centripetal acceleration. Now, how do you calculate that (given the parameters of the circular motion)?