Discussion of Question with ID = 004 under Volume-and-Surface-Areas

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Question

How much water flows per hour through a pipe of radius 10 cm, if water flows at 10 km/h?

A

100 π cu. m.

B

102 π cu. m.

C

98 π cu. m.

D

104 π cu. m.

Soln.
Ans: a

In one hour, a water column of length 10 km is delivered through the cylindrical pipe. The equivalent volume is π × ${10 × 10 × 10 × 1000}/{100 × 100}$, which can easily be cancelled to get 100π cu. m.


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