 #1
 84
 2
Homework Statement
There is a table, and a napkin on it. The napkin has a mass mn=71.6 g. On the napkin, there is a tea cup with mass mc=104.6 g. What is the minimum force required for someone to pull the napkin out from under the tea cup? Assume that between the table and the napkin the friction is µk= 0.484, while the coefficient of static friction between the tea cup and the napkin is µs=0.705. Express your answer in Newtons.
Homework Equations
F=ma
The Attempt at a Solution
ΣF_{xNapkin}=Ffr_{C}fr_{T} (where C is cup and T is table)
ΣF_{xCup}=fr_{N} (where N is napkin)
I have also included a photo of my FBD
How can I proceed with this question? Do I have a correct FBD?
Attachments

28.9 KB Views: 295