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How do i solve these questions (fluids/ Fluid flow)

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Darkstar3000:
These were the questions given to me by my teacher but i can't get it!

1.Calculate the pressure difference between the two ends of a hosepipe 20cm long and radius 0.5cm if the rate of flow of water through it is 0.8 litres per second. ....viscosity of water = 1 x 10(to the power -3)


2.Oil flows steadily through a uniform pipe of length 2m and internal diameter of 1.0cm . If the flow rate is 8.5 x 19(to the power -6)m(cube)/sec calculate the pressure difference between the ends of the pipe... viscocity of oil = 0.01 NS/m(square)

EDEXCEL

vanibharutham:
i have NO idea how to solve either question,

but i think i may have a guide for the first one....

is this for EDEXCEL or CIE

Have you heard of Bernoulli's Equation? maybe that might help

astarmathsandphysics:
dp/dx=8vQ/(pi*r^4) where v is viscosity

then pressure difference=0.2 * this answer

Darkstar3000:

--- Quote from: astarmathsandphysics on January 01, 2010, 02:07:20 pm ---dp/dx=8vQ/(pi*r^4) where v is viscosity

then pressure difference=0.2 * this answer

--- End quote ---

what is dp, dx and Q

astarmathsandphysics:
dp is pressure difference
dx is length of pipe and Q is rate of fluid flow

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