Power & Energy: Waterfall & Turbine Questions

[penza]

I have two questions
a)Water flows over a waterfall of height 75m of volume flow rate 6.0ms-1 and then lands in a pool below.
Outline the energy changes that take place


b)It is suggested that installing a turbine of the waterfall could provide a source of electrical energy. Estimate the power that might be available, stating one assumption that you make.
(The denstity of water= 1000 m-3)

 

[siddharth]

Do you have any thoughts/ideas on this problem? You need to show your work to get help.

 

[penza]

Do you have any thoughts/ideas on this problem? You need to show your work to get help.

for sure i thought about it but i don't know...

 

[Hootenanny]

Would you mind posting what you have done thus far? The guidlines of these forums state clearly that one should show one's work before receiveing assistance.

 

[penza]

actually first i thought what energy transfer and i put 75/6 and but then i thought you just have to explain meaning that it goes from vaporisation to convection

 

[Hootenanny]

actually first i thought what energy transfer and i put 75/6 and but then i thought you just have to explain meaning that it goes from vaporisation to convection

What ?? I was thinking more along the lines of potential energy ---> kinetic energy?

 

[penza]

ho yeh so actually the energy changes are from potential energy ---> kinetic energy, so that's actually the answer...
thank you

 

[Hootenanny]

What are your thoughts for question (b)...?

 

[penza]

What are your thoughts for question (b)...?

for question B i thought that because they have to install a turbine, looking that the density of water is 1000 than you have to do 1000/6 which is the flow rate so then to find the estimated power

 

[Hootenanny]

for question B i thought that because they have to install a turbine, looking that the density of water is 1000 than you have to do 1000/6 which is the flow rate so then to find the estimated power

You have just basically rephrased the question there . Here's a hint: Think about mass and the relationship in question (a).

 

[penza]

You have just basically rephrased the question there . Here's a hint: Think about mass and the relationship in question (a).

yeh but what do you to find the power

 

[Hootenanny]

HINT Power is the rate at which energy is transfered;

$$P = \frac{dE}{dt}$$

 

[penza]

HINT Power is the rate at which energy is transfered;

$$P = \frac{dE}{dt}$$

ok got it thank you

 

[Hootenanny]

ok got it thank you

Your welcome