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Please help me, I got a question about hydraulic resistance!!?

There’re 2 equations.
A: P1-P2 = (128*dynamic viscosity* pipe length / pi * diameter power 4) * flow rate
B: P1-P2 = Reynolds number * density of fluid * flow rate *
|flow rate| / (2 * area square)
Who knows the difference between A and B?
I used B and got a Time variable, rest are constant in B, ’cause I want to have a dynamic eqution.
However, I have no idea about the distinction about A and B and I just would like to calculate the flow rate in a pipe with hydraulic resistance and because I got a acceleration dx/dt from the piston, I’d like to use dx/dt to obtain the flow rate in the pipe, but I don’t know in which equation I could put dx/dt. Someone could tell me the difference between A and B and which one I could use and why and have something else or you could show some paper to explain it!
Please help me!!!

It’s a long time since I did this stuff, but . . .

Equation A is okay for streamlined flow in a smooth pipe only.

In equation B, the Reynolds number is a function of viscosity, fluid velocity, pipe diameter, pipe wall roughness and maybe other things. Equation A is probably the limiting case when the Reynolds number is small enough. You would need equation B for turbulent flow.

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What do you think about this…?

Okay so i’m going to be getting my first car soon, and my grandma is offering her Crystler Spirit. It has like 54,00 miles on it its a 1995. It has some rust and the power steering fluid leaks. Also, there are no power windows or power locks. One good thing about it, is she bought it brand new, and so she has been the only owner, which is good because then i’ll know the history. She’s selling it to me for about 1,000 dollars..Do you think that’s a good deal? Do you think this is like a good first car? Or is it too much of a grandma car…i’m a girl if that matters..

It sounds like a pretty good deal to me. It looks like it will make a great first car.

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Try a Used Roadtrek RV Now!

If you are thinking of buying a used RV, why not get a used RoadTrek?

The RoadTrek is superior in terms of stability since it has a lower center of gravity compared to RVs by other manufacturers. For better weight distribution, water tanks are located near the axes. With a wheelbase longer time (compared with the total length) a Roadtrek provides stability road beaten. (A Roadtrek 190's length of only 58% longer than its wheelbase compared to 91% for a 22 'B + motorhome with a 138 " wheelbase.) It also has excellent suspension, steering and braking capacity of the chassis.

Chevrolet has a body construction on a frame, a short rear overhang, "Normal" and "towing" transmission modes, and an optional locking differential transmission cooling external (n / a on 170 and Sprinter) provide superior performance for towing.

As the Roadtrek is small, easy to park. As the Chevy Roadtreks base do not even seem campers, you can avoid parking restrictions and an RV park in regular spaces.

A Roadtrek is more than a family van. You might even be purchased as a second car for the family. It has 6 forward facing seats with seat belts. The cost of owning and operating a Roadtrek is far less than a second car in the driveway and a trailer in storage! Moreover, RVs depreciate slower compared to an ordinary car and have Roadtrek RVs higher resale value compared to other campers.

Thanks to its aerodynamic shape and smaller size and weight, Roadtreks are not large consumers of fuel. On the ground floor on Chevy models allows a low ceiling, sweeping. The heat pump (air conditioning and heating) is built in the rear, fitted with grills only visible from the rear. The refrigerator vent is disguised and integrated into a black grill on the window blinds of the kitchen while the fresh water fill is located on a passenger side or rear door. This is to prevent tampering. To achieve superior ventilation, the Roadtreks have large frameless awning windows that not only look better and provide superior vision, but protects from rain and wind noise reduction.

Other features that are standard on Roadtreks can not be in other recreational vehicles. Some include the integrated waste water from the hose into the 170 and 190; pump wastewater into the macerator 210 and RS, cloverleaf dining table; temporarily closed bathroom / privacy area; stand-up aisle shower, ground floor, built-in heat pump, exterior compartments storage under the floor, deposits on the floor, dual layer foam beds and more.

Given all these additional features, you can consider to buy a used RV Roadtrek motorhome as their first that is ideal for national holidays.

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Good Classical Song for Band Students to Play?

My friends and I are doing a solo for our next concert… the instruments we play are…
Piano
French Horn
Flute
Clarinet
Also Saxophone
does anyone know of a good classical song that we can play? like maximum 3-4 minutes? and where we can get the music sheetS? we wanted to do canon in d major or loves greeting, but it was too “confusing” to find
thanks !!

Hi! I am a professional musician, and would like to give you two suggestions.

You will find a lot of musical ideas at www.luybenmusic.com. Look under ‘clarinet catalog’, then ‘clarinet with mixed instruments’ or ‘clarinet with winds’. Everything is in alphabetical order by composer. Most of the things are really for professionals, but it’s worth a try. You’ll have to ask your conductor if the music you find is suitable for your level.

Your BEST bet is to go to your band or orchestra director and they will help you. I imagine he/she will want you to divide up into a couple of groups. There is a lot of music for flute/clarinet/piano, or a piece by Rae for clarinet and sax. I do not know of anything for the specific group that you mentioned…..but he/she might write something for you!

Best wishes!

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Social Distancing is the Key to Minimising Bird Flu Infection in your Staff and Protecting your Small Business

Second to frequent hand washing, the next best way to protect yourself and your staff is to minimise or eliminate close contact and proximity to others. This is ‘Social Distancing’ and is the term being used more and more frequently as people learn what measures they can take to try to minimise the chance of contracting Bird Flu when the pandemic starts.

There are a number of ways you can encourage social distancing in the workplace. For example crowded places and large gatherings of people should be avoided, whether in internal or external spaces.

A distance of at least one meter should be maintained between persons wherever practical. Larger distances are more effective.

Visiting of, or other contact with, unwell people should be avoided wherever practicable.

Avoid meeting people face to face, use the telephone, video conferencing and the internet to conduct business as much as possible, even when participants are in the same building.

Avoid handshaking and any other greeting which involves person to person contact.

Avoid any unnecessary travel and cancel or postpone non-essential meetings, gatherings, workshops and training sessions.

If possible, arrange for employees to work from home or work variable hours to avoid crowding at the workplace.

Practice ‘ghost’ shift changes wherever possible, with the shift going off duty leaving the workplace before the new shift enters. If possible, leave an interval before re-occupation of the workplace. If possible, thoroughly ventilate the workplace between shifts by opening doors and windows or turning up the air-conditioning.

Avoid public transport. Walk, cycle, drive a car or go early or late to avoid rush hour crowding on public transport

Bring lunch and eat at desk or away from others. Avoid the cafeteria and crowded restaurants. Consider introducing staggered lunchtimes so numbers of people in the lunch room are reduced.

Do not congregate in tearooms or other areas where people socialise. Do what needs to be done and then leave the area.

If a face-to-face meeting with people is unavoidable, minimise the meeting time, choose a large meeting room and sit at least one meter away from each other if possible, avoid shaking hands or hugging. Consider holding meetings in the open air.

Set up systems where clients and customers can pre-order, request information via phone, email, fax and have the order or information ready for fast pick-up or delivery.

Encourage staff to avoid recreational or other leisure classes, meetings etc. where they might come into contact with infectious people.

If the company does not utilise business internet banking, set it up and begin the migration immediately.

Encourage staff to apply for and use personal internet banking. This will allow them to avoid making unnecessary trips to the bank.

Try using conference calling equipment instead of face to face meetings. Get people comfortable with using it now and they’ll be ‘ready trained’ when the need to make conference calls instead of meeting becomes serious.

You can find more ideas to help you prepare your business for a pandemic outbreak of Bird Flu by visiting Bird Flu Manual Online. Start your preparations and training now before it’s too late.

About the Author

Nigel Thomas is a veteran business continuity professional. He is also the operator of Bird Flu Manual Online, a reference and resource mine designed to help you get your business prepared for Bird Flu. Learn how to conduct your own risk assessment or how to increase your staff awareness. No login required.

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