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acspin
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Homework Statement
An airbus A320 jetliner has a takeoff mass of 75,000 kg. It reaches its takeoff speed of 82 m/s in 35 s. What is the thrust of the engines? You can neglect air resistance but not rolling friction. (The force of rolling friction is given by Fr = [tex]\mu[/tex]r N
Homework Equations
Fr = [tex]\mu[/tex]r N
V = V0 + at
[tex]\Sigma[/tex]F = ma
T = thrust
The Attempt at a Solution
The first thing i did was solve for the acceleration. I got 2.343 m/s2.
From here I set
[tex]\Sigma[/tex]F = T - [tex]\mu[/tex]r N = ma
Thus:
T = ma + [tex]\mu[/tex]r mg
Then
T = m (a + [tex]\mu[/tex]r g)
So:
T = 75,000kg (2.343 m/s2 + [tex]\mu[/tex]r9.8 m/s2)
I don't know what the heck to do from here. There is no way I can calculate the coefficient of rolling friction, and it is not given. So I have 2 unknowns and 1 equation. Does this problem need more info?
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