Engineering - December 2006

2006-12-08 10:02:45 · 5 answers · asked by Cody W 1

Sample A has a mean of 194 hours and a standard deviation of 10.67 hours.
Sample B has a mean of 204.0 hours and standard deviation 9.02 hours.

i) Show whether the data provides evidence that sample A are more variable than sample B.
ii) Show whether the data provides evidence that spark plugs sample B last longer on average than those from sample A.

2006-12-08 09:39:09 · 3 answers · asked by tycho1a 1

2006-12-08 09:29:09 · 4 answers · asked by zoomraker 1

This is for a tower I am building for a contest. It must be made completely of wood, and I have to make a design for it. I am baseing it on skyscrapers. It must have a flatish top.

2006-12-08 09:24:41 · 7 answers · asked by Anonymous

10 points for a correct answer.

2006-12-08 09:13:37 · 4 answers · asked by stone 3

What exactly is the power rating of a particuar applicance signifying and why's it given as a range instead of a single value? e.g, my kettle says it has a power range of 1850-2200W. Thanks.

2006-12-08 09:09:01 · 9 answers · asked by Anonymous

2006-12-08 08:51:14 · 1 answers · asked by m 1

2006-12-08 08:50:51 · 12 answers · asked by Salamander 2

2006-12-08 07:50:05 · 6 answers · asked by Anonymous

2006-12-08 07:42:24 · 4 answers · asked by ilovebrightpinkflowers 1

If I add more restriction (system head) to a water circulator pump, the flow goes down. Do the Amps drawn by the pump go up or down? I have seen conflicting charts on this. Does a deep well pump act differently than a circulator (Taco 007)? Why would it? Thanks BBP

2006-12-08 07:26:52 · 3 answers · asked by buffalobillpatrick 1

The line will be an 8" header for vacuuming services in a power plant (flyash). We've used steel in the past but the are heavy and expensive to replace when they erode through. I was wanting to use a cheap plastic (PVC or CPVC). I don't think PVC will work temperature wise as the ash can sometimes be around 250-300F. Is there any other relatively inexpensive plastic pipe I can use that has a good thermal rating (like CPVC) but is better at resisting erosion??

2006-12-08 07:24:25 · 2 answers · asked by tac 2

You recently had an auto accident that was your fault. If you have another accident or receive another moving violation within the next 3 years, you will become part of the "assigned risk" pool, and you will pay an extra $600 per year for insurance. If the probability of an accident or moving violation is 20% per year, what is the probability distribution of your "extra" insurance payments over the next 4 years? Assume that insurance is purchased annually and the violations register at the end of the year - just in time to affect next year's insurance premium.

2006-12-08 07:20:06 · 4 answers · asked by tkh24 1

2006-12-08 07:08:53 · 7 answers · asked by nhale24 1

2006-12-08 06:56:03 · 1 answers · asked by dean c 1

Also why do some phase plugs have a hole in the center and some don't?

2006-12-08 05:41:50 · 1 answers · asked by lord_greatmane 4

2006-12-08 05:25:25 · 1 answers · asked by m 1

2006-12-08 05:14:34 · 1 answers · asked by snazzygoutham 1

I know some about Geothermal but i am having a hard time finding statistics on this to make my speech offical, could some one help?
Hot springs keep spas running and are a vacation destination for many. Not only can this energy be used for recreation, but it is also useful in the agricultural world because it heats green houses and is used in the industrial world to produce hydrogen, pasteurize milk and other processed items.

2006-12-08 05:09:18 · 7 answers · asked by wrestlerchick 2

2006-12-08 05:09:04 · 9 answers · asked by Smellyteddy 3

I know there are bs in computer science and ba in computer engineering and about 15 other degrees that 'sound' like they would be it but I don't know whats better???? If you know what degree 'looks' better let me know that too! thanks in advance

2006-12-08 04:46:39 · 6 answers · asked by TEXAS 2

Electrical Engineering......which areas pay more.....is it DSP, Embedded , FPGA, control or someother speciality area?

2006-12-08 04:41:06 · 2 answers · asked by Anonymous

volatge is written as 12-0-12 and at secondary there are 3 terminals.. What mean by 12-0-12 and why there are 3 terminals ? from which terminals I will get 12 v supply ?

2006-12-08 04:30:32 · 4 answers · asked by Electrosam 3

I’m needed to cut a solid non-uniform solid object made from several parts into cross-sectional pieces. I have tried cutting the assembly via plains but have been unsuccessful in viewing them. Think about cutting a steak into 1/4 in wide strips, each strip shows the cross section of the meat at that point. I have access to Solid Works 07 and am running 04 on my machine. If there in another program better suited I would be open to it.

2006-12-08 04:10:40 · 1 answers · asked by Dr-G 2

2006-12-08 04:07:07 · 2 answers · asked by Peter M 1

the elliptical trammel is essentially a mechanical device which is used to couple two shafts.

2006-12-08 03:14:22 · 2 answers · asked by coolshake 1

2006-12-08 03:04:35 · 5 answers · asked by Student 1

joint be closed?

2006-12-08 03:02:15 · 2 answers · asked by Anonymous

We all know that magnets of the same poles repel each other. Can we use that behavior of a magnet to run the motor of a small fan?

2006-12-08 02:57:48 · 5 answers · asked by cncrned 1

I have an x10 system and some outlets don't work now.

2006-12-08 02:43:04 · 6 answers · asked by Anonymous