Engineering - October 2007

150 sin 377t

2007-10-23 05:47:14 · 4 answers · asked by Wyatt M 1

A camera's flash is powered by a 5.00×10−4 F capacitor. When the capacitor is fully discharged, It takes 2.00 seconds to get 99.0% recharged. A resistor is in series with the capacitor. What must its resistance be?

2007-10-23 05:03:39 · 2 answers · asked by Jaylen R 1

Find SOP and POS of function (x1,x2,x3,x4) with E(0,2,8,9,10,15) + D(1,3,6,7)

After drawing my kmap i got....


SOP
F= x1'x2' + x2x3x4 + x1x2'x3 + x1x2'x3x4'


POS
F= (x2'+x3)(x2'+x3'+x4)(x1'+x2+x3'+x4)

2007-10-23 04:08:08 · 1 answers · asked by chs_soccer_02 2

An op amp has the following specifications:

op amp used as a comparator
–18 V < VSupply < +18 V
maximum difference in supply voltages = 32 V
supply voltages are +15.2 V and –15.2 V
rail headroom voltage = 1.1 V (for both + and – supplies)
A = 1.5*106
maximum output current = 21.9 mA.

The input voltages are Vni = 3.8 mV and Vinv = 13.7 mV.

The output voltage of the op amp is _______ V.

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completely lost

2007-10-23 03:35:25 · 2 answers · asked by sn4ke1 3

A mobile phone company is setting up a transmission tower next to our workplace. We would like to know what metal/material sheet and its thickness that would be effective to block out the direct microware n electromagnetic radiation from that tower. The tower is within 12meter from our workplace.

2007-10-23 02:25:03 · 4 answers · asked by luyi 1

i have this project on nuclear energy and i want to answer this question please do anwer it

2007-10-23 02:20:38 · 10 answers · asked by shardul p 1

could we have cars without electricity

2007-10-23 02:18:32 · 5 answers · asked by GERARDisWAYcoool 1

To accomplish this idea the force made by one team while pulling the rope is measured by a spring sensor. This data is sent to a motor or actuator on the other side in order to respond accordingly: to pull if the data received is bigger than the force currently made by the team or to push otherwise. The same process is followed for the other team.
Do you know a spring scale whose output can be read by a computer and a motor / actuator that can be controlled by a computer (and according to the readings given by the spring scale)?

2007-10-23 01:43:31 · 1 answers · asked by Javier L 1

2007-10-23 01:34:23 · 3 answers · asked by Anonymous

I am planning to use 10e-7 F capacitor. And I want t high and t low of 1 sec each. That means a duty cycle of 50%. I check many websites. They only provide the equations to calculate. They never show the working. Since R1 << R2, when I calculate I got R1 to be 0. It is wrong. Please provide the working also. Thanks

2007-10-23 01:28:45 · 5 answers · asked by curious 3

2007-10-23 00:21:41 · 1 answers · asked by Srijit Sen 1

2007-10-22 18:37:59 · 2 answers · asked by deepak_8584 1

34. Power transmission lines often use a form of electric current called alternating current, but in many regions, such as the Province of Quebec, high-voltage direct-current lines are used instead. Direct current is the kind of electric current you are studying in this chapter. A certain direct-current power transmission line has a resistance of 0.255 Ω/km. 812 kV of potential drives the current from the generating station to a city located 125 km from the plant.

2007-10-22 17:41:57 · 4 answers · asked by Brittney J 1

what is it exactly? is it a high or low frequency wave? is it technically sound?

2007-10-22 14:57:22 · 3 answers · asked by Anonymous

2007-10-22 14:53:10 · 3 answers · asked by slow ride 1

wanting to build a robot to organize my closet....any ideas?

2007-10-22 14:45:38 · 2 answers · asked by Anonymous

It is possible to optimise the bacterial consortia in an activated sludge process by adjusting the operational conditions. Thereby problems like high numbers of free swimming bacteria or sludge with poor settling properties can be reduced. what are the factors that can influence the microbial composition in the process and why?

2007-10-22 14:28:29 · 4 answers · asked by king_dipu 2

I am currently making $15 an hour, would I be making more in this new fied?

2007-10-22 13:02:05 · 4 answers · asked by jthansen2275 2

requirements:
3 balls. release each ball after 10sec always two of them at one exit, labbled A, and one B at a 2nd exit. Always repeating AABAAB...
anyone has good suggestions?

2007-10-22 11:19:06 · 2 answers · asked by Anonymous

2007-10-22 11:02:06 · 26 answers · asked by beccaboo 1

I am not sure what materials we would need but I know this is possible...

2007-10-22 11:00:34 · 4 answers · asked by todd 2

I was just curious :]
Like in their every day job how do they use it?

2007-10-22 10:33:22 · 4 answers · asked by Valerie 2

I was told that aluminum cans need to be full size in order for the magnets to induce current into the cans better and give enough force to adequately separate them. I did a search and could not find any info verifying this. It seems odd to me that it would make that much of a difference or that the equipment couldn't be designed to work well with crushed cans.

2007-10-22 10:15:14 · 2 answers · asked by reDSP 2

ive looked on google but nothing please help

2007-10-22 09:58:48 · 2 answers · asked by Anonymous

2007-10-22 09:14:38 · 3 answers · asked by goku 1

I made this machine using stepper motors witch works on X and Y axis what kind of progroming languge and i/o devoice do I need to learn about in order to make it work ?

2007-10-22 09:10:46 · 2 answers · asked by Cheetah 1

where could I find some clear and complete sketches or technical drawings for centrifugal pumps?
and I'd like some sites on design considerations, as in machining ones..
Thanks!

2007-10-22 08:53:07 · 1 answers · asked by Psycho 3

I'm very creative and always wanted to make my own inventions I am currently going to college for engineering and have some auto cad experience and a good knowledge of electrical workings of products .I would love to work for a new up and coming company. Or any company with new product inventions.If you have any suggetions for a good work place in nj (central) that would be great.

2007-10-22 08:50:06 · 2 answers · asked by tom b 1

explain them to me.

especially finding # of strands, input force, and max wieght lifted.

2007-10-22 08:15:06 · 1 answers · asked by ♥xoxo 3

2007-10-22 08:10:25 · 5 answers · asked by Anonymous