- #1
Jennifer001
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Homework Statement
a toy train rolls around a horizontal 1.0m diameter track. the coeffifient of rolling friction is 0.10
a. what is the magnitude of the train's angular acceleration after it is released
b. how long does it take the train to stop if it's released with an angular speed of 30rpm.
Homework Equations
At=r(alpha)
A=v^2/r
Ff=uk*ma=uk*mg
The Attempt at a Solution
i know I am suppose to look for the angular acceleration but i don't know what the tangential acceleration is, is there a relationship between centripetal acceleration and tangential .. also i don't know how to include the friction coieff. into an equation..
PLEASE HELP IM SO LOST!
so i have