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Figure 10-56 gives angular speed versus ...

Figure 10-56 gives angular speed versus time for a thin rod that rotates around one end. The scale on the `omega` axis is set by `omega_(s)=60rad//s`. (a) What is the magnitude of the rod's angular acceleration? (b) At t = 4.0 s, the rod has a rotational kinetic energy of 1.60 J. What is its kinetic energy at t = 0?

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(a) `1.5rad//s^(2)`, (b) 0.40 J
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