Recent content by KAISER91

Once I know Vr, I will get qr Then I can resolve the flow for the prototype using this; qr = qp/qm qp = qr x qm with qm given as 0.1

Homework Statement A model spillway has a flow of 100 L/s per m of width. What is the actual flow for the prototype spillway if the model scale is 1:20? Homework Equations qr = qp/qm The Attempt at a Solution My attempt; qm = 100 L/s per m = 0.1 m^3/s per m Using the...

Help With Soil Questions... Homework Statement Any help will be appreciated. The moist weight of a soil is 16.5 kN/m^3. Given w = 15% and Gs = 2.67 determine; (a) dry unit weight (b) porosity (c) degree of saturation (d) mass of water, in kg/m3, to be added to reach full saturation...

Homework Statement To build a triangular pile consisting of 120 balls, the number of balls in the base would have to be?? Multiple Choice a. 24 b. 30 c. 36 d. 45 Homework Equations The Attempt at a Solution The answer is 36. How do I get this answer and is...

Yep. Nevermind, I have found out my problem. I was using the wrong button on the calculator for exponential. LOL

http://oi53.tinypic.com/68su2o.jpg" This is the worked answer given

Yes I'm sure. Let me take a screenshot of it for you.

Yep, I see the factorial button. I'm using a CASIO 100 so it's simply shift + x^-1 on the calculator.

I have tried that several times but keep coming up with the wrong answer. LOLI think it may be something else I'm doing wrong.e^-20 simply means the exponential of -20 ? right??

I think it simply means the factorial of 18 It's from the Poisson probability distribution formula, which is; f (x) = (e^-lambda x lambda^x ) / x! And I just plugged in the values of x and lambda I'm not sure how to evaluate this

I'm not sure what you mean. The answer to the question is 0.0844

Homework Statement How do I evaluate this Poisson distribution? Homework Equations The Attempt at a Solution So I have figured out what the values for lambda and x are, but I don't know how to evaluate once I plug the values into the formula. λ = 20 x = 18 = [ e^-20...

(tanh^-1 b) (-2) I forgot the b. (tanh^-1 b) is v and -2 is simply the derivative of (2-2b) so that is -2 tanh^-1 b which is the second part.Thanks for your help.

Homework Statement Find the Derivative of the function y = (2 - 2b) tanh^-1 b? Homework Equations The Attempt at a Solution The answer given is [2 / (1 + b)] - 2 tanh^-1 b I've tried this question several times to no avail. I used the product rule with u = (2 - 2b) and v...

Homework Statement Differentiate y = sinh^-1 (1/x) Homework Equations The Attempt at a Solution y' = 1 / sqrt 1 + (1/x)^2 x -1/x^2 Really confused with this. Is there a different method to this like; y = sinh^-1 (1/x) sinh y = 1/x Thanks