Engineering - January 2007

A wall 2m high x 1.2m thick has a unit weight of 24kN/m3.
It is subject to a horizontal load of 10kN/m run at a height of 0.7m.

Calculate the factor of safety against sliding if the coefficient of friction = 0.45

....I'm having trouble with this question and would appreciate any help I can get. Cheers.

2007-01-15 07:06:08 · 3 answers · asked by Anonymous

Is there a difference between these two and if so what

2007-01-15 07:02:21 · 3 answers · asked by pop c 2

2007-01-15 06:01:18 · 7 answers · asked by K C 1

I use an auxiliary battery in a Volkswagen Westfalia camper and, until now, it gets recharged with the alternator when the vehicle is running. I have just installed a 15-watt solar panel on the roof to provide charging when the vehicle is stationary for several days. I have installed a voltage regulator to prevent overcharging. When the vehicle is running, the battery would be getting charge from both the solar panel and the alternator. Can I safely do this or do I have to disconnect the solar panel every time I turn on the engine? Thank you for your help.
Roger

2007-01-15 05:58:52 · 6 answers · asked by Roger T 1

Looking to design a pre-treatment step to remove silica for a RO desalination plant, but need a good idea of the flow rate to such a plant.

2007-01-15 05:26:55 · 1 answers · asked by Jesse B 1

A microwave oven operates with radiation having a wavelength of 20.0 cm. Calculate the energy of this radiation in joules per photon.
________J/photon
Calculate the energy of this radiation in kilojoules per mole of photons.
______ kJ/mol

2007-01-15 04:44:06 · 2 answers · asked by Krazyk78 1

mostly i have noticed that ordinary ceiling fans rotate in counter clockwise direction.. i'm not tallking about the ones with the option to switch directions... just the ordinary ones that can rotate in only one direction... standing below the fan i observed so... whereas in front of an ordinary table fan i noticed that it rotates clockwise... Someone tell me why is this?????

2007-01-15 04:42:46 · 4 answers · asked by hurricanefabian85 1

I want to build a small 500w (ish) wind turbine. I have batteries, metal etc not sure what dynamo + regulator I need, would an old car dynamo/regulator work?

2007-01-15 04:36:49 · 2 answers · asked by Paul B 1

* Or Computer science
*I know Math is needed but what kind of math?

2007-01-15 04:33:56 · 3 answers · asked by Grim Angel 1

2007-01-15 04:23:57 · 1 answers · asked by CHB 2

2007-01-15 03:37:24 · 3 answers · asked by steven p 1

It is an electronic switch that can alternate at high frequencies. Stay on or stay off etc...

But how does the silicon in a transistor conduct a flow of electrons to one leg or another, without any problem.

It is one thing to know and accept this, but to understand it is what I want to do.

2007-01-15 03:17:40 · 4 answers · asked by Anonymous

i need to build an FM transmitter, please help me if you can (its better if you can teach me to build from an FM receiver..........
anyway, i need to build it without spending money..............

2007-01-15 02:53:41 · 4 answers · asked by suseendar 1

Something I always wondered when getting into and elevator. I've never gotten into one that has one of these fancy escape hatches overhead. Does any of the major manufacturers actually produce models with escape hatches. Or is this something that can be bought as an extra option. the expensive hatches overhead and the cheap ones underneath LOL
So is it just hollywood or do such elevators exist.

2007-01-15 02:20:32 · 2 answers · asked by peter gunn 7

I need to know for a project.

2007-01-15 02:12:05 · 1 answers · asked by Anonymous

If I need to rent my aircraft to some one , Is there any calculation need to be done to calculate the cost of hours ?

2007-01-15 02:02:11 · 3 answers · asked by COUGAR 1

2007-01-15 01:50:51 · 3 answers · asked by skjk 1

i have a photo of a room taken at an angle along one wall.
i konw the ceiling height an some other measurements, can i work out the legnth of the wall from this photo?
i dont want to go back to remeasure if i can avoid it.

2007-01-15 01:05:47 · 6 answers · asked by Anonymous

2007-01-15 00:53:38 · 1 answers · asked by refard 1

2007-01-14 23:58:01 · 2 answers · asked by mohammad javad y 1

2007-01-14 22:49:15 · 6 answers · asked by jitu 1

2007-01-14 22:14:35 · 11 answers · asked by AJKen 1

2007-01-14 22:14:20 · 2 answers · asked by Marifel P 1

2007-01-14 20:47:04 · 9 answers · asked by rishi 2

if my house uses 1200 watts an hr. how do i fig. out the size generator that i would need to power it , if power is lost. if any one could tell me how i would be greatful. thanks

2007-01-14 20:23:33 · 3 answers · asked by joe s 1

2007-01-14 19:10:51 · 1 answers · asked by c_lok 1

2007-01-14 18:39:32 · 2 answers · asked by Anonymous

I have a game I'm building and my magnets affect each other

2007-01-14 18:17:14 · 6 answers · asked by Sam J 1

2007-01-14 16:25:00 · 2 answers · asked by paintballa 1

2007-01-14 15:48:55 · 2 answers · asked by pooja g 1