WATER FLOWS FROM A HOSE-PIPE OF OF INTERNAL DIAMETER 1CM AT A RATE OF 5 LITRES PER MINUTE. AT WHAT SPEED IS THE WATER FLOWING THROUGH THE PIPE?
1 litre = 1000 cubic centimeters
In the question, 5000 ccs pass every minute.
Think of that as a rod of of water, 1cm in diameter
Volume = lengtharea = 5000 cc
length = volume/area
area = pir^2, where r = radius of pipe.
r = 0.5 cm (half the diameter)
length = 5000/(pi(0.5)^2) cm
= 20000/pi cm
That's the length per minute, so the speed is
(20000/pi) cm/minute<<<
(20000/(60pi)) cm/second<<<
The speed of the water flowing through the pipe is \(\frac{20000}{\pi *60}\) cm/seconds
Speed is the "rate of change of position of object in any direction. Speed is measured in the ratio of distance by time taken".
According to the question,
House-pipe internal diameter is 1 cm and water flows at a rate of 5 liters per minute
Radius of pipe = 1/2 = 0.5 cm
Area of circle = π.r²
Area of pipe = π.r²
= π (0.5)²
= 0.25π
Area of pipe = 0.25π
1 liter = 1000 cubic centimeters
5 liters = 5000 cubic centimeters
Volume of the pipe = Length of the pipe * Area of the pipe
Volume of the pipe /(Area of the pipe ) = Length of the pipe
Length of the pipe = 5000/0.25π
=20,000/π cm/minute
Length of the pipe is equal to Distance
Speed formula = Distance/time taken
Speed of the pipe = \(\frac{20000}{\pi *60}\) cm/seconds
Hence, the speed of the water flowing through the pipe is \(\frac{20000}{\pi *60}\) cm/seconds.
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