A centripetal-acceleration addict rides in uniform

Chapter , Problem 60

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A centripetal-acceleration addict rides in uniform circular motion with radius r = 3.00 m. At one instant his acceleration is \(\vec{a}=\left(6.00 \mathrm{~m} / \mathrm{s}^{2}\right) \hat{\mathrm{i}}+\left(-4.00 \mathrm{~m} / \mathrm{s}^{2}\right) \hat{\mathrm{j}}\). At that instant, what are the values of

(a) \(\vec{v} \cdot \vec{a}\) and

(b) \(\vec{r} \times \vec{a}\) ?

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