Recent content by JosephF

Thanks for the link. P=0.5 * air density * swept area * wind velocity3 Taking air density as 1.23kg per cubic meter. P=0.5 * 1.23 * 20 * 103 P=12,300Watts 40% efficent so output power is 4,920Watts. Is this correct as the value seems quite high? Also there was no mention of...

Homework Statement 1. A wind turbine with a swept diameter of 20m and an efficiency of extracting energy from the wind of 40% is subjected to an average wind speed of 10m/s. (a) How much power might the turbine produce? Please can some one point me to the right equation as everyone I...

Brilliant. Thanks for the help.

Is it just the mass of the total gas / volume. So; Density = 0.546648658 / 1.0x10-2 =54.66486586kg/m3 Have I got the unit correct? Thanks

Apologies for numerous posts today, I'm trying to catch up from work I missed last term, and my uni is on holiday at the moment so can't get help from lecturers. I've got these two questions. I think I've correctly worked them out however I'm currently stuck on the last part. How is density...

That brilliant. Thanks again.

3. The Attempt at a Solution i) Φ is at a minimum when θ=0 ii) ΔΦ=650x(2.5x10-3)x(0.02x0.035)sin30 =1.1375x10-3sin30 =5.6875x10-4Wb iii) Flux linkage is maximum when θ=90 ΔΦ=1.1375x10-3sin90 =1.1375x10-3Wb ----------------- Ah, that was careless of me! Thanks for...

Apologies for numerous posts today, I'm trying to catch up from work I missed last term, and my uni is on holiday at the moment so can't get help from lecturers. I've been set the following which I think I've got correct, but not 100%. Am I right in calculating the area in m2? Homework...

Ah yes, that looks better. Whats my next step? Do I need to input it into a truth table or do I go streight to the logic gates? Also, can and AND statement have more than 2 inputs? Thanks,

I also got 1927.7108... Thanks for your help Rory :)

Ok. I'll show you the question and hopefully I've gone in the right direction. Homework Statement A power line supplies electrical energy to a transformer in a manufacturing plant. The input voltage to the transformer is 11,000V. The transformer changes this to 415V for use in the...

Homework Statement I'm using the following equation: Is Vs = Ip Vp Is the current measured in Watts or kW? Homework Equations n/a The Attempt at a Solution n/a

Homework Statement I'm studying logic gates and trying to create my first one. Homework Equations 3. In a TV programme, the panel votes on new performers. The panel consists of a Chairman (C) and three others (X, Y and Z) who each press a button to register their vote. The SUCCESS light is...

Hello, I am currently studying A-level physics over here in the UK. I now have the task of preparing a 15 minuite interactive speach which counts towards my final mark. My choosen element for this speach is Steel. I have searched the internet and looked in books but I am finding it very...