Recent content by madmike159

Homework Statement A ball is thrown vertically upwards from a roof of a building and it lands 3 seconds later on the ground 7 meters below the roof. Calculate: a) the speed with which the ball was thrown upwards b) the maximum height of the ball above the ground c) the speed with which the ball...

Do you have to do this in Jsim, or just work out the output for different values of A, B and C?

Just realized my OP was incorrect. The pump is rated to 250L/h not L/s...

Thanks, I didn't think to check the Reynolds number. As Baluncore said, my flow rate is far to high which explains some higher than expected oil temperatures. I won't be blindly choosing the first pump I find next time.

Thanks guys. I had already found the Hagen-Poiseuille Equation, but I used the flow rate incorrectly (m^3/h rather than m^3/s). I now have a reasonable answer and know a limit of the size of pipe I should use.

What do you mean by output head?

I have a enclosed system for cooling bearing housings with oil. I need to calculate the rough pressure that will be produced when the oil pump is switched on. The oil will be pumped from a small tank, through the system and back into the tank. Pipe diameter = 10.8mm Pipe length = aprox 2m...

Sorry, here is a link. http://en.wikipedia.org/wiki/Graham%27s_number It is so large it has to be written using the up arrow notation. http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation Basically the bottom line is 3 \uparrow\uparrow\uparrow\uparrow 3 Basically I think you can...

General problems should really go in the maths section, rather than the homework help section. If you want to know exactly how vectors relate to the real world, you could be asking a very deep and complex (and philosophical) question. In general though vectors give magnitude and direction...

They look the same to me. Power source has the same function as a battery, what did you mean by overlapping of the wires?

I was reading random topics on Wikipedia the other day, and saw something about the first 500 numbers of Grahams' Number. I want to create a program (probably in C#) to calculate as many digits from it as I can, but I haven't be able to make sense of the way it is done. Would someone be able...

Ok thanks. When you say the missing t term, should there be a t on the top of the left fraction?

I take it what I did was still wrong though. Any pointers on what I am doing wrong?

That was a typo, no idea why I put integrating, I did mean differentiating. I believe that setting the differential to 0 would allow the minimum point to be found (that is the point where the noise is lowest/SNR is the highest)

I have just directly differentiated the top line and bottom line with respect to k, using the quotient rule (assuming that |k|2 = k2). This is what I got: http://gyazo.com/c5301f7e5c8f23d85622e1d2fbc9bb82 (I can never get the math input working on here)