Engineering - October 2007

I need to figure this out.
1. What is the percentage of error?
Measured versus calculated
Error formula = (calculated – measured/calculated x 100
For example (3.45 ohms - 3.127/3.45) x 100 = 9.36 %

2007-10-17 18:04:25 · 3 answers · asked by Anonymous

i'm an engineering student and the topic we're discussing in analytic geometry right now is about family of lines..but i don't understand how we are going to get the other member of the family of lines when the only given is the slope.oh geez!!i have been surfing the net but i've seen nothing 'bout that topic..yeah, it includes the parameter but we're not in vectors yet.please help!!if you have ideas about what i'm saying, share it please...thanks!!

2007-10-17 17:51:59 · 2 answers · asked by Anonymous

Does "the number of electrons traveling trough (per square centimeter per second)", tell me the conductance of a circuit with resistors connected in serial/parallel? Or not quite and are they just remotely connected words?

2007-10-17 16:34:38 · 5 answers · asked by me c 2

I am a 16 yaer old kid, so don't suggest stuff that cost over $150.
I already know the basic programming language, so i would prefer a basic stamp controller. But i also need a dev board which is the most expensive, i checked ebday, but the only good ones are expenisve (100 and up), and cost is a MAJOR problem. I am going to make my first robot, but i am planning to go into contests for robots to win more $$$, so i would prefer that i could switch th ic to a better faster stamp later on when i have more money. My first one is gonna be a line follower, then im gonna modify it to "visualize" and make paths to another place (i know this involves complex coding). So any ideas?

2007-10-17 11:18:51 · 2 answers · asked by hak8or 3

2007-10-17 10:27:07 · 15 answers · asked by Anonymous

the really tall buildings usually have a spire at the top, i.e. cn tower, sears tower, empire state building.

what is their purpose?

2007-10-17 09:22:12 · 10 answers · asked by cuppycakes! 1

I need to know the tools required for building a FIRST robot (i.e. drills, ect.). Thanks!!!

2007-10-17 09:05:54 · 4 answers · asked by bookworm_628 2

2007-10-17 08:25:02 · 6 answers · asked by Anonymous

angle theta, in terms of vehicle speed, mass, frontal area, drag coefficient, coefficient of rolling resistance, theta, and acceleration due to gravity. What is the power when the car is 1500kg and the hill is 15 degrees and the vehicle speed is 50mph.

2007-10-17 07:41:39 · 2 answers · asked by Kai K 1

1.)
When a given source circuit (Circuit S) is connected to a load resistor, RL, under what condition will the maximum power transfer to the load resistance from the source circuit occur?
A. If the load resistor is an open circuit, RL = ∞.
B. If the load resistor is a short circuit, RL = 0.
C. If the load resistance is one half of the Thevenin equivalent resistance of Circuit S.
D. When the load resistance is equal to the Thevenin equivalent resistance of Circuit S.

and.....

2.)
Mesh current analysis can be used for:
A. Any circuit.
B. Only circuits containing independent voltage sources.
C. Any planar circuit.
D. Whenever node voltage analysis can be used.



3.)
For the current source in a Norton equivalent circuit, the magnitude of the current can be determined by placing a short circuit across the terminals of the circuit, and determining the current through the short circuit. True or False

2007-10-17 07:19:36 · 3 answers · asked by Yahoo 1

A proton (mass 1u) moving at 6.90 Mm/s collides elastically and head-on with a second particle moving in the opposite direction at 2.80 Mm/s.after the collision,the proton is moving opposite to its initial direction at 8.62 Mm/s.FInd the mass and final velocity of the second particle???

2007-10-17 07:06:33 · 2 answers · asked by kian K 1

it is very important.pleazzzzzzzzzzzzz soonnnnnnnnnnnnnnnnnnnnn.thanks

2007-10-17 06:59:20 · 3 answers · asked by Anonymous

This question is along with the first one I asked.

2007-10-17 05:25:55 · 3 answers · asked by Anonymous

I have a pocket PC with a USB charger that connects to the 220v wall plug. It gives 5 volts and 1 amp.

Then my brother lost his Motorola and gave me his charger. It's also USB, also 5 volts, but only 0.55 amps.

It would be convenient if I could have one more in use for the PDA. But... shall I try it? Is it safe?

Thanks in advance!

Rock

2007-10-17 04:35:25 · 2 answers · asked by Rock S 1

2007-10-17 04:16:28 · 3 answers · asked by steve b 2

What is the change in internal energy (in J) of a system that releases 612 J of thermal energy to its surroundings and has 515 cal of work done on it? Show work

2007-10-17 04:10:31 · 3 answers · asked by bumblebee 4

2007-10-17 03:28:32 · 4 answers · asked by Anonymous

2007-10-17 03:11:33 · 12 answers · asked by ASH 1

im drawing a steakhouse layout in an existing commercial building (located in a mini mall type building-in a row of buildings, tanning, tobacco store, etc.). what type occupancy and what type construction would this be under. where can i find a website that has this information on it. thanks

2007-10-17 02:42:18 · 1 answers · asked by oxford_guys_2cents 2

single core cable run in metal trunking 60metres from supply to first of 12 140w flourecent lights, lights fitted end to end over a distance of approx 20 mtrs

2007-10-17 02:15:14 · 3 answers · asked by frosty 1

Ive come to a place and got stuck i need to convert my findings into a vector equation from parametric form:
my results are:
x=-5-8t
y=3-7t
z=-9+3t

would the final answer just be:
r(t)=[(-5-8t), (3-7t), (-9+3t)]

any help would be great thanks

2007-10-17 01:51:18 · 2 answers · asked by Anonymous

Why not just use 240V? It seems simpler to have three evenly powered phases any of which can be paired with any other resulting in 240V power. Do certain applications require 208V? How do you know which type of service you have in your home?

I understand more or less HOW it is made (i.e. the high leg in the three-phase system - it just seems strange to have this odd leg - it seems like it would throw off the symetry of the 3-phase "braid."

also what would happen if the delta leg were paired witha regular 120 leg by accident?

2007-10-16 21:35:13 · 5 answers · asked by Anonymous

i need 2 know some stuff about long sight eyes :
* ITs causes and treatment
*HOw this application of light works
*and Provide a written explanation of the scientific principles it demonstrated. ( e.g Automatic door sensors - " Light travels in stright lines" .)
.....

2007-10-16 21:26:28 · 4 answers · asked by ***Jaleh*** . 1

If a car alternator (rotor) runs at 1500 rpm, how much watt will it produce? Does any one know? I don't need exact value.

2007-10-16 20:43:30 · 5 answers · asked by Mani 1

I seem to recall learning somewhere that it's not electrically possible to measure the voltage across the secondary of a transformer. However the more I think about it the more I can't quite figure why that would be so, and I am really just curious as to weather it's true at all and if so why exactly it's not possible?

2007-10-16 18:42:24 · 6 answers · asked by Charles H 1

Nitinol (memory) wire usually comes in lenghts. I need one made into a circular loop in order to make a heat engine

2007-10-16 17:37:38 · 4 answers · asked by Anonymous

The project is about hydropower. I made this dam type thing and I have a water pump like device( the ones they use in aquariums to filter the water). Anyways the water pump pumps the water over the dam. I also made a turbine out of 2 margarine container caps( they are circular and are made out of bendy plastic) and I attached some soda bottle caps to the middle of the caps.... I know this is kinda confusing....umm it looks like a water wheel. This water wheel is the turbine for the dam. I attached the water wheel to the dam by means of a copper wire and I had to make a hole in the margarine caps in order to pass the wire through. I also bought a 9 volt DC motor and I attached it to a light bulb. The DC Motor has like a spoke thing and whenever the spoke turns electricity is produced. I need to know how to attach the DC MOTOR to the water wheel so whenever the wheel turns it turns the spoke and produces electricity. If anyone could help me I would be reaally grateful to them. Thanks.

2007-10-16 17:23:41 · 4 answers · asked by Amitha 2

Kilowatt /hr conxumptio of: ff attached to a 500VA regulator
1 110 v 60 w TV..1 Dell laptap pc 110-240 V w/60 W adapter
1 DSL modem 220V w/adapter
thank ypu

2007-10-16 15:13:56 · 3 answers · asked by Ricardo S 1

2007-10-16 15:10:08 · 2 answers · asked by lecaris w 1

Why cant it be used in a closed loop system.

2007-10-16 13:56:04 · 6 answers · asked by theroadwetake 3