Physics Gods help me answer this problem!

Test Preparation
1

<p>A flight attendant pulls her 70N flight bag a distance of 253m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle 52degrees ave the horizontal. Find the following: a)the work she does on the flight bag b)the work done by he force of friction on the flight bag C) the coefficient of friction between the flight bag and the floor.</p>

<p>I already have the answer to part A. Part B and C is baffling me. Someone help answer this. Thanks</p>

2

<p>I think i got the answers but lets see the work out anyways.</p>

3

<p>Here are my answers:</p>

<p>A)
W = (F cos 52) * d</p>

<p>B)
same as A, except negative</p>

<p>C)
W = F<em>d
F = mu</em>F<em>n
(substitution)
W = mu * F</em>n * d
mu = W / (F_n * d)</p>

4

<p>I should point out that:</p>

<p>F_n = 70 - F sin 52
(F = 40N, the force exerted by the flight attendant)</p>

<p>Many people will probably put that F_n = 70N...this is INCORRECT!</p>