Rate at which the water level rises or falls in a cylinder, cone or bowl

1. A.
   $\frac{1}{6\pi}\,\text{cm/s}$
2. B.
   $\frac{1}{6\pi}\,\text{cm/s}$
3. C.
   $\frac{1}{16\pi}\,\text{cm/s}$
4. D.
   $\frac{\pi}{16}\,\text{cm/s}$

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1. A.
   $\frac{4}{\pi}$ m/min
2. B.
   $4\pi$ m/min
3. C.
   $\frac{1}{4\pi}$ m/min
4. D.
   $\frac{\pi}{4}$ m/min

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1. A.
   $\frac{1}{5\pi}$
2. B.
   $\frac{1}{15\pi}$
3. C.
   $\frac{2}{\pi}$
4. D.
   $\frac{1}{10\pi}$

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1. A.
   $16\pi\ \text{cm/sec}$
2. B.
   $\frac{16}{\pi}\ \text{cm/sec}$
3. C.
   $\frac{1}{16\pi}\ \text{cm/sec}$
4. D.
   $\frac{\pi}{16}\ \text{cm/sec}$

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1. A.
   $\dfrac{2}{9\pi}\ ft/sec$
2. B.
   $\dfrac{4}{9\pi}\ ft/sec$
3. C.
   $\dfrac{8}{9\pi}\ ft/sec$
4. D.
   $\dfrac{10}{9\pi}\ ft/sec$

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