# Angular Velocity vs time Graph

1. Nov 11, 2009

### keemosabi

1. The problem statement, all variables and given/known data
Figure 10-22 is a graph of the angular velocity versus time for the rotating disk of Fig. 10-21a.

For a point on the disk rim, rank the instants a, b, c, and d according to the magnitude of the radial acceleration, greatest first (use only the symbols > or =, for example b=d>a>c).

2. Relevant equations
$$\alpha$$ = d$$\omega$$/dt

3. The attempt at a solution
I figured that the angular acceleration is just the slope of the angular velocity graph, so the magnitudes from greatest to least would be c>a>b=d.

What did I do wrong? The site says that I am wrong.

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2. Nov 11, 2009

### tiny-tim

Hi keemosabi!