# Angular acceleration

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1. Jan 17, 2016

### Jam51

1. The problem statement, all variables and given/known data
An airplane makes a circular turn of radius 9 km at a constant speed of 650 km/h. Calculate the magnitude of the plane's a. angular velocity, b. centripetal acceleration, c. angular acceleration, d. tangential acceleration

2. Relevant equations
w = v/r
aR = w^2r

3. The attempt at a solution

I found angular velocity to be 0.02rad/s and centripetal acceleration to be 3.62m/s^2

If the speed is constant would the angular and tangential acceleration be zero? I'm not sure that I am understanding the theory behind this.

2. Jan 17, 2016

### BvU

Definitely . Angular acceleration $\alpha = {\Delta \omega\over \Delta t} = 0$ for constant angular velocity $\omega$.
And tangetial acceleration is $\alpha r$; both are constant in your exercise. On to the next one !

3. Jan 17, 2016

### Jam51

Thanks

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