Previous in Forum: Heat Transfer   Next in Forum: Shoulder Screws - Pros/Cons
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
10 comments
Rate Comments: Nested
mulangu
Member

Join Date: Sep 2009
Posts: 8

dynamics

10/01/2009 12:17 PM

An automobile travels at a constant speed on a highway curve of 1000m radius.If the normal component of acceleration is not to exceed 1.2m/s,what is the maximum allowable speed.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
JohnDG
Guru
United Kingdom - Member - Not a New Member Hobbies - Musician - New Member Hobbies - Fishing - New Member

Join Date: May 2006
Location: Reading, Berkshire, UK. Going under cover.
Posts: 9684
Good Answers: 468
#1

Re: dynamics

10/01/2009 12:25 PM

Homework alert!!!!!!!!

__________________
 "Love justice, you who rule the world" - Dante Alighieri
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#2
In reply to #1

Re: dynamics

10/01/2009 12:39 PM

And bad homework too. Acceleration should be in m/s2

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply
mulangu
Member

Join Date: Sep 2009
Posts: 8
#3
In reply to #2

Re: dynamics

10/01/2009 2:12 PM

Hey guys, don't be funnyi was trying to figure out something for my group mates.But thanks for your help.
Register to Reply
2
Doorman
Guru
Hobbies - DIY Welding - Don't Know What Made The Old Title Attractive... Popular Science - Weaponology - New Member United States - US - Statue of Liberty - 60 Year Member

Join Date: Apr 2009
Location: Yellowstone Valley, in Big Sky Country
Posts: 7425
Good Answers: 295
#4

Re: dynamics

10/01/2009 2:39 PM

Formula for maximum allowable speed:

1/PI f^2(x) dx = a(0)^2 / 2 + (k=1..) (a(k)^2 + b(k)^2)Where:

f = Price of tires (US$)/ Number of windows on car

x = Liter Displacement of powerplant (assume petrol) / Lumens from the moon available

d = Efficiency of driver (represent as decimal)

a = Effective use of parking lot (represent as decimal)

k = Number of beverages available to driver / Number of beverages already consumed by driver

b = Aggravation factor of getting a speeding ticket

This gives maximum allowable speed 299,792,458 meters per second for my car.

Getting a lot of mileage out of this one... No more, I promise.

Adjustments to the formula may need to be made for your actual conditions.

With apologies to Parseval... and just about everyone else too

__________________
 Semper Ubi Sub Ubi
Register to Reply Good Answer (Score 2)
No more Good Answers.
mulangu
Member

Join Date: Sep 2009
Posts: 8
#8
In reply to #4

Re: dynamics

10/01/2009 11:12 PM

Thanks
Register to Reply
jack of all trades
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8777
Good Answers: 376
#5

Re: dynamics

10/01/2009 2:39 PM

<hmmmm>

You don't mention the bank of the curve which will effect the maximum allowable speed. Also the vehicle mass, centre of gravity, track and tyre friction, vehicle aerodynamics, etc will likely play a part (unless you want a rough estimate).

If you have a NASCAR track locally you could try it in practice (oh science and physics are so much more fun when you put them into a practical and group-participation context). Fairly safe too as I doubt any of you have a vehicle fast enough to exceed the maximum allowable speed. No beer for the driver thou!

__________________
 jack of all trades
Register to Reply
The Blind Tinkerer
Participant

Join Date: Oct 2009
Posts: 2
#7
In reply to #5

Re: dynamics

10/01/2009 8:17 PM

you also have to take in to affect how much weight is in the "car" as well as how much the driver weighs.
Register to Reply
Codemaster
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#10
In reply to #7

Re: dynamics

10/05/2009 5:05 AM

You don't need to take account of that or the factors mentioned in #5. Assuming he meant 1.2 m/s2, it's fairly clear he just wants to know what speed gives that centripetal acceleration (let's take his word that it's not homework!). Formula is acc = V2/r giving V = 34.64 m/s.

By appropriate banking of the track, the net force on the car can be eliminated, but the centripetal acceleration is still there.

Cheers........Codey

__________________
 Give masochists a fair crack of the whip
Register to Reply
mulangu
Member

Join Date: Sep 2009
Posts: 8
#9
In reply to #5

Re: dynamics

10/01/2009 11:14 PM

Thanks
Register to Reply
nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#6

Re: dynamics

10/01/2009 5:25 PM

The one indicated in "solutions" chapter of your prof book
Register to Reply
Register to Reply
Have a Different Question?
10 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

Codemaster (1); Doorman (1); jack of all trades (1); JohnDG (1); mulangu (3); nick name (1); redfred (1); The Blind Tinkerer (1)

Previous in Forum: Heat Transfer   Next in Forum: Shoulder Screws - Pros/Cons

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (79 right now)
Show Members
Advertisement