Water flows from a tap into cylindrical container at the rate 5\picm\(^3\) 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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
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)
Source: Myschool Past Questions Archive (Record #26410)