A fire hose has a diameter of 2.5cm and is required to direct a jet of water to a height of at least 40 m. The minimum power of the pump needed for this hose is:
Text Solution
Verified by ExpertsThe correct answer is:
A
The speed of the water leaving the horse must be 
if it is to reach a height h when directed vertically. If the diameter is d, the volume of water ejected at this speed is 
.
Mass ejected is 
The kinetic energy of this water leaving the hose = 
mv 2
= 
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