Engineering - September 2006

Going to build trailer ramps. Can be no thicker than 2". 6' long
Thank You in advance.

2006-09-21 14:32:45 · 4 answers · asked by Anonymous

Ultimately, I would like to calculate the amount of money wasted by not isulating the pipes. I know the diameter and length of the pipes, the initial temperature of the water in the pipes and the ambient temperature of the space through which the pipes pass.

2006-09-21 14:25:21 · 7 answers · asked by DANIEL R T 2

THE QUESTION:
Initially, a rigid 6-m^3 tank contains helium (assumed to be an ideal gas) at 300 K and 0.10 MPa. The tank is then heated until the temperature reaches 400 K.

A pressure-relief valve at the top of the tank opens when the pressure reaches 0.15 MPa, and the helium flows out, preventing the pressure from exceeding 0.15 MPa. Determine the final mass (kg) of helium in the tank.


MY ANSWER:
So, in hoping that people don't think I just posted this up here without trying, this is what I've done so far--

I couldn't really come up with a way to go use PV=nRT a couple of times to keep transforming. What I noticed though is that I **THINK** I have everything I need for the final state.

I just looked at the state after the process. It MUST have the same V. And it tells us the P&T. I used V=6 P=.15 T=400. As the question described, it sounds like this is the final state. I calculated n from this using PV=nRT, and converted it to kg using its amu.

thoughts?

2006-09-21 14:06:23 · 5 answers · asked by wilburrr 2

I am looking for a online calculator that will do fractions. I need it for school.

2006-09-21 14:05:53 · 2 answers · asked by Alex M 2

2006-09-21 13:43:50 · 3 answers · asked by Stevie D. 1

2006-09-21 13:26:30 · 6 answers · asked by acage123 3

2006-09-21 12:30:57 · 5 answers · asked by Agustín G 1

2006-09-21 12:26:07 · 2 answers · asked by Mona 1

Does anyone know what distances (rough estimates) can be achieved using 40G (OC-768) over standard single mode fiber given Duobinary, NRZ, RZ, CS-RZ, DPSK, or DQPSK modulation schemes?

Thanks,
Eric
ebreverman@lightriver.com

2006-09-21 11:31:50 · 2 answers · asked by ejbrever 1

2006-09-21 11:05:19 · 10 answers · asked by d_s_miller 1

I have some problems in MSC ADAMS/Car

2006-09-21 08:33:27 · 1 answers · asked by Anonymous

I need info on stepherson (the inventor of the lighthouse)
I need stuff like the date it was created, what it was made of and how it worked etc. can you give me some info?

2006-09-21 08:16:47 · 6 answers · asked by j d 1

1- the properties of electrical transformers . \2-their uses . \3-their applications.

2006-09-21 07:59:14 · 7 answers · asked by Anonymous

Specific answers please.

2006-09-21 07:32:01 · 3 answers · asked by MRINMOYII 1

Fujitsu PC 1 yr old, intel pentium 4 ,512 RAM ,no sound card no graghics,

windows xp home edition xp


i already deleted Limewire,install AVG Norman MSN antivirus,spydoctor,spybot,adaware,

did a system restore back to 1 Aug 2006

2006-09-21 07:08:03 · 5 answers · asked by Xhxhxhtfhhxgfhghfxxx 2

any one know how to calculate if it has infinite life cycles ? hope somone can show calculation.
Grade :316
Frequency : 1500
Amplitude : 10
limiting stress : 207MPa

2006-09-21 06:16:29 · 1 answers · asked by Charles T 1

any one know how to calculate if it has infinite life cycles ? hope somone can show calculation.

2006-09-21 05:25:43 · 3 answers · asked by Charles T 1

I want to create a switch in a circuit which will be operated by a beam of laser light being interupted. (I am making a speed detector using two lasers, 2 meters apart). What is the electronic componant I need to buy which will act as a light-sensitive switch but using red laser light and not sunlight?

2006-09-21 05:17:24 · 5 answers · asked by Paul D 3

What kind of material is used and is it glued together?

2006-09-21 05:08:04 · 3 answers · asked by fred 1

2006-09-21 05:02:39 · 3 answers · asked by Anonymous

2006-09-21 04:34:31 · 3 answers · asked by philax_america 1

Atterberg Limit Test

2006-09-21 04:26:51 · 3 answers · asked by Jon L 1

2006-09-21 04:19:21 · 4 answers · asked by CIBUMOL B 1

2006-09-21 04:09:27 · 5 answers · asked by teetu s 1

This is problem one on my worksheet, and all the rest I've found to be easy, so I'm thinking I'm missing something here:

A vertical cylinder fitted with a frictionless piston contains air at 100C The piston has an unknown m and a diameter of .150mm, and the ambient pressure outside the cylinder is 101kPa. If the cylinder volume is 500 liters and the mass of the air is 5kg, what is the piston mass, m?

I calculated the pressure inside the cylinder and it is huge. That means the piston would accelerate upwards. Since the sum of the forces on the piston must equal its mass times acceleration, I used something like (AFTER i had obtained the inner pressure):

p(sys)*a(piston) - p(ambient)*a(piston) - mass(piston)*gravity = mass(piston)*acceleration(piston)

The trouble is, is that i know neither the acceleration or the mass of the piston.

2006-09-21 04:07:37 · 2 answers · asked by Sean H 2

2006-09-21 03:26:58 · 12 answers · asked by intelligentbutdizzy 4

I understand that it has to do with density of the water to the density of the ship, but explaining it to a child doesn't work. I read somewhere that it also has something to do with displacement of water. I will need to explain this to my children (and my wife too).

2006-09-21 03:25:00 · 12 answers · asked by extra_37 4

It was a potential problem in spacecraft such as Apollo

2006-09-21 02:04:34 · 3 answers · asked by Jojo the circus boy 2

2006-09-21 01:40:37 · 4 answers · asked by Princess 2

i'm trying to make the chocolate evenly spread out on a mould after deposition. mould is conveyed past the cantilever.

2006-09-21 00:42:18 · 5 answers · asked by Charles T 1