Recent content by BIGEYE

Thanks, that's got him thinking. To find the time it takes to hit the ground, he will first need to find the height the projectile gets to.

My son is just starting his advanced highers physics and asks on how best to approach/solve this problem: A projectile is launched from the top of a building with an initial speed of 20 m s-1 at an angle of 30° to the horizontal. The height of the building is 30 m. (a) Calculate how long...

I have managed to get a look at earlier bills and there is a charge for kVAr, it varies quite a bit, but I'm expecting a big jump due to PFC being turned off. I am thinking along the correct lines?

We operate a 3 phase, 11kV network with automatic power factor correction equipment installed. Over the last four weeks we have had the PFC switched off due to an electrical incident. How can I calculate the cost of running without PFC for this period of time, our load is fairly constant at...

Image links: http://tinyurl.com/9yvsw3" http://tinyurl.com/7ou8pa" http://tinyurl.com/8vqxkj" http://tinyurl.com/7k85ze" http://tinyurl.com/7wrvjk" http://tinyurl.com/7s4v9p" http://tinyurl.com/7vtvhl" http://tinyurl.com/7z3yhq" http://tinyurl.com/7r6g6a"...

We do have a maintenance program and the CB was maintained recently onsite, which is basically a service of external components. However, there is a recommendation (that we didn't know about as it is not stated in the O&M manual), that the CB is serviced at factory after 2000 ops. This had not...

Not an installation problem, circuit breaker has been in operation for a few years. We are focusing on the following as the cause: Synchronising problem Excessive number of operations, 2439 ops. Loss of SF6 gas. The extent of destruction of the CB has taken everyone by surprise...

We have had a catastrophic failure of an SF6 circuit breaker. This breaker was used as a synchronising breaker for a CHP on our 11kV system. Does anyone have or can point me to articles on failures (causes & effects) of SF6 circuit breakers. TIA

thanks thanks for that

Missed some class notes due to being sick. Anyway have a tutorial question I need some help with as I missed out on the subject. For an 8 bit ADC, how many clock pulses are required for an exact mid-signed range. I think 4, appreciate if someone can advise. TIA

Let me try again! I made a complete balls of that question, everything was wrong. Let me try again, I have to evaluate the closed loop gain of the loop C/R, using the laplace operator s. The correct circuit is attached. I can do this problem manually, but it is very tedious and easy to amke a...

I am new to Derive 6 and Laplace Transforms. Is it possible to solve the closed loop gain A/B of the attached loop using Derive 6. If it is possible, can someone guide me through the steps using Derive, as the problems that lie ahead will be much more complex, and I want to use Derive in the...

Appreciate if someone could take the time to look at the following problem, my answers, and can point out where I have went wrong. Also, part 4, I think more info. is needed to determine this, but I may be wrong. Anyway, here goes: A hoist motor is attached to a support beam as shown in the...

Where am I going wrong? Appreciate if someone can take a look at this and show me where I am going wrong. A conical pipe with inlet diameter 80mm and inlet pressure 0.5 bar, is inclined so that the outlet is 2m higher than the inlet. The outlet diameter is 140mm, the fluid density is 1000 kg/m3...

Thnx for taking the time.