The radii of the base of two cylindrical tins, P and Q ar...
The radii of the base of two cylindrical tins, P and Q are r and 2r respectively. If the water level in p is 10cm high, would be the height of the same quantity of water in Q?
4.5cm
5.0cm
7.5cm
20.0cm
Correct answer is A
volume of cylinder = πr2h
volume of cylinder p = πr2×10
= 10πr2
volume of cylinder Q = π(2r)2h
= 4πr2h
4πr2=10πr2h
h = 104=4.5cm
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