Engineering - November 2007

a spherical snowball is melting. its radius is decreasing at 0.2 cm per hour when the radius is15 cm. How fast is its volume decreasing at that time?

2007-11-01 15:53:53 · 2 answers · asked by Sultana 2

2007-11-01 15:32:30 · 5 answers · asked by dieseltank 1

2007-11-01 13:33:17 · 5 answers · asked by a a 1

Harvard University are developing one with a wingspan of 3cm, doesn't power itself as yet but flies.

2007-11-01 12:49:31 · 6 answers · asked by Chris cc 1

It needs to be shaped either like a square or rectangle, NO circles or any other shapes that the measurement cant be read accurately for volume.

it does not have the be the same height all around...


im looking for it to hold atleast 50 pennies.

2007-11-01 12:25:44 · 7 answers · asked by Anonymous

What maximum output would you expect from a wind turbine wiht a blade of diameter 20ft in a 15-mph wind?

2007-11-01 12:22:47 · 1 answers · asked by gods1princesschanel 1

2007-11-01 11:49:53 · 12 answers · asked by Alexander 6

2007-11-01 11:45:07 · 3 answers · asked by Alexander 6

For electric cars, why don't we have an electric motor, powered by batteries, each battery recharged by alternators in each wheel. As the wheel turns, the alternator generates power to charge the batteries, going down hills, the wheels turn without or at least with reduced assistance. Also, regenerative braking. Everytime the brakes are applied, a generator that is embeded in the pad will turn. Obviously the brake generator pad will have to be replaced from time to time. Anyway, I just thought of it earlier and it seems so simple that I must be overlooking some glaring reason it won't work or someone would probably already be doing it. I'm not saying it would be perpetual motion, it would just be ultra energy efficient. So please, if there are any oversights I made that render this idea impractical, please let me know.

2007-11-01 11:25:53 · 17 answers · asked by Jim 2

2007-11-01 10:22:44 · 17 answers · asked by DuranDoll 6

2007-11-01 10:07:45 · 11 answers · asked by djquack12 1

If i have a question:
Design an 3 bit clocked up-down counter using
(i) D flip-flops
(ii) J-K flip-flops

what exactly do i have to do? I dont get it... do i need 3 inputs???

thnx so much

2007-11-01 09:41:14 · 3 answers · asked by Danielle 3

hunting, spray cans, mountain climbing, and skiing. At the same time, they greatly underestimate the risks of such hazards as x-rays, swimming, electric power, home appliances, and surgery. why should this be?

2007-11-01 09:12:03 · 2 answers · asked by oge 4

For example if you switched your house from incandescent to compact fluorescent lighting then your electric bill will obviously be decreased. However, because each bulb is no longer transferring 80% of its power to heat wouldn't your heating bill increase by approximately the same margin as you just decreased the electric?

Just something that has always bothered me and restrained me from using financial reasons for making the switch. Also I am aware that this is only a factor during the winter and in colder enviroments. Thoughts?

2007-11-01 08:22:08 · 6 answers · asked by faith_no_more26 2

the technique should be simple, inexpensive and we should be able to carry out the poling process in the laboratory .. and plz let me know the details of the process and all the parameters that control the process.... parameters like temperature, time etc ..........?

2007-11-01 07:49:58 · 1 answers · asked by chetan 1

im building a roof out of popsicle sticks for a project in geometry and i have to write a paper to show the accuracy of the roof. i need to know the reasoning for the angle of the roof

2007-11-01 07:36:50 · 15 answers · asked by ? 3

Any good websites that help someone with very basic science knowledge?

2007-11-01 07:08:55 · 7 answers · asked by snowball 3

2007-11-01 07:06:32 · 2 answers · asked by Anonymous

2007-11-01 06:57:37 · 2 answers · asked by Karthick S 1

2007-11-01 06:22:02 · 3 answers · asked by Anonymous

It is said that speed of a induction motor is
N = 120* f / P

then how do you vary speed of a ceiling fan using a regulator

2007-11-01 05:45:58 · 3 answers · asked by Mukesh Dak 3

2007-11-01 05:38:15 · 5 answers · asked by phantasm 2

Place the generator on anything that vibrates and it will produce
a current.

2007-11-01 05:35:29 · 3 answers · asked by Ken 1

would be used in the military???


its for cllege and i dont undestand
so basically.. give me the meaning of this:


Temporary area command positions (TCPs) — normally placed on higher ground with point-to-point viewing.

2007-11-01 04:43:11 · 2 answers · asked by Latitude 4

In a machine shop with 100 automatic machining centres, a maintenance technician serves an 8 hour shift. If there is on average 12 machine breakdowns per 24 hours and if a Technician is away from the workshop 1 hour whenever he or she inspects a breakdown, how many technicians are needed on any given shift to have no more than 1% chance of a Breakdown going undetected? Assume breakdowns are detected only from the workshop

2007-11-01 02:53:24 · 1 answers · asked by aquarius16thuk 1

i have a project on electrical circuit and i want it to be simple and exclusive

2007-11-01 00:36:17 · 9 answers · asked by shahzadiarif 1