Direction of acceleration or force in uniform circular motion from a position or momentum vector

1. A.
   $- \frac{v^{2}}{R}\sin\theta\widehat{i} + \frac{v^{2}}{R}\cos\theta\widehat{j}$
2. B.
   $- \frac{v^{2}}{R}\cos\theta\widehat{i} + \frac{v^{2}}{R}\sin\theta\widehat{j}$
3. C.
   $- \frac{v^{2}}{R}\cos\theta\widehat{i} - \frac{v^{2}}{R}\sin\theta\widehat{j}$
4. D.
   $- \frac{v^{2}}{R}\widehat{i} + \frac{v^{2}}{R}\widehat{j}$

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1. A.
   $v = - 4\widehat{\imath}\frac{m}{s},a = - 8\widehat{\jmath}m/s^{2}$
2. B.
   $v = 4\widehat{\imath}\frac{m}{s},a = 8\widehat{\jmath}m/s^{2}$
3. C.
   $v = 4\widehat{\jmath}\frac{m}{s},a = 8\widehat{i}m/s^{2}$
4. D.
   $v = - 4\widehat{\jmath}\frac{m}{s},a = 8\widehat{i}m/s^{2}$

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1. A.
   $\frac{\pi}{2}$
2. B.
   $\frac{\pi}{6}$
3. C.
   $\frac{\pi}{4}$
4. D.
   $\frac{\pi}{3}$

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1. A.
   Opposite to the direction of $\overrightarrow{r}$
2. B.
   Opposite to the direction of $\overrightarrow{L}$
3. C.
   Opposite to the direction of $\overrightarrow{P}$
4. D.
   Opposite to the direction of $\overrightarrow{L} \times \overrightarrow{P}$

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