How to find he coefficient of kinetic friction?

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Homework Help Overview

The discussion revolves around a physics problem involving the coefficient of kinetic friction. The scenario describes a flight attendant pulling a flight bag along a level floor, with specific forces and angles provided. Participants are attempting to solve for the work done and the coefficient of kinetic friction based on the given parameters.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculation of work done by the attendant and the force of friction. There is confusion regarding the calculation for the coefficient of kinetic friction, with one participant questioning the validity of a computed value and another providing a different answer.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered in the form of a suggestion to draw a Free Body Diagram to clarify forces acting on the flight bag. However, there is no explicit consensus on the correct approach to finding the coefficient of kinetic friction.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information available for solving the problem. There is also an emphasis on understanding the relationships between the forces involved, particularly the normal force and frictional force.

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A flight attendant pulls her 70.0 N flight bag a distance of 269 m along a level airport floor at a constant speed. The force she exerts is 32.0 N at an angle of 52.0° above the horizontal.

(a) Find the work she does on the flight bag.
_5299_J

(b) Find the work done by the force of friction on the flight bag.
_-5299_ J
(c) Find the coefficient of kinetic friction between the flight bag and the floor.
____

i found part A, by 32.0 x 269 x cos(52.0) = 5299J

but i don't understand how to get part c

i keep doing 32Cos(52)=70-32sin(52)k and i get .1357, don't get what I am doing wrong HELP!??
 
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What is the matter with the value .1357?
 
the answer is .4397
 
What is the normal force the floor exerts on the flight bag?

Draw a Free Body Diagram.
 

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