What do I do for these problems ?

  • #1
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
 
Last edited:

Answers and Replies

  • #2
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
38


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?
 
  • #3


Is it the centrapical Acceleration?
 
  • #5
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
38


Is it the centrapical Acceleration?

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

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