Water flows from a tap into cylindrical container at the rate 5πcm 3 per second....
MATHEMATICS
WAEC 1999
Water flows from a tap into cylindrical container at the rate 5πcm3 per second. If the radius of the container is 3cm, calculate the level of water in the container at the end of 9 seconds.
- A. 2cm
- B. 5cm
- C. 8cm
- D. 15cm
Correct Answer: B. 5cm
Explanation
Volume of water after 9 seconds = \(5\pi \times 9 = 45\pi cm^3\)
Volume of cylinder = \(\pi r^2 h\)
\(\therefore \pi r^2 h = 45\pi\)
\(\pi \times 3^2 \times h = 45\pi\)
\(\implies 9h = 45 \)
\(h = 5 cm\)
(where h = height of the water after 9 secs)
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