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Symstar
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Homework Statement
A bicyclist coasts down a 6.0 degree hill at a steady speed of 4.5 m/s.
Assuming a total mass of 60 kg (bicycle plus rider), what must be the cyclist's power output to climb the same hill at the same speed?
Homework Equations
Newton's 1st law
P=W/t
The Attempt at a Solution
[tex]P=\frac{W}{t}=F \cdot v[/tex]
Set x-axis along incline...
[tex]F-mg\sin\theta=0[/tex]
[tex]F=mg\sin\theta[/tex]
[tex]P=mg\sin\theta*4.5 = 276.6 W[/tex]
To 2 sigfig = 280 W
Is this correct? I'm being told it is the wrong answer...