Old 09-7-2006, 07:37 PM   #1
lbinator
FFR Player
 
lbinator's Avatar
 
Join Date: Dec 2004
Location: I live in Ontario, Canada
Age: 30
Posts: 94
Send a message via MSN to lbinator
Default Help with my physics...

Question: An airplane travels at 1800km at a speed of 1000km/h. It then encounters a headwind that slows it down to 850km/h for the next 2300km. What was the average speed of the plane for this trip?

The answer according to the sheet is 550km/h, it doesn't explain how this answer was achieved but when I tried it my answer was 909.921671 Km/h.

Can anybody get 550km/h? or was I actually right?
lbinator is offline   Reply With Quote
Old 09-7-2006, 07:51 PM   #2
GuidoHunter
is against custom titles
FFR Veteran
 
GuidoHunter's Avatar
 
Join Date: Oct 2003
Location: Texas
Age: 36
Posts: 7,379
Send a message via AIM to GuidoHunter Send a message via Skype™ to GuidoHunter
Default Re: Help with my physics...

First attempt I got 909, too, but that's just by doing total distance/total time, so nobody else try that. =)

--Guido

http://andy.mikee385.com
__________________

Quote:
Originally Posted by Grandiagod View Post
Quote:
Originally Posted by Grandiagod View Post
She has an asshole, in other pics you can see a diaper taped to her dead twin's back.
Sentences I thought I never would have to type.
GuidoHunter is offline   Reply With Quote
Old 09-7-2006, 07:55 PM   #3
Reach
FFR Simfile Author
Sectional ModeratorFFR Simfile AuthorFFR Veteran
 
Reach's Avatar
 
Join Date: Jun 2003
Location: Canada
Age: 33
Posts: 7,462
Send a message via AIM to Reach Send a message via MSN to Reach
Default Re: Help with my physics...

hmm, well, logically, the average can't possibly be 550 since the plane doesn't go any slower than 850 mph XD

It's wrong.


Your answer is correct.
__________________
Reach is offline   Reply With Quote
Old 09-7-2006, 07:55 PM   #4
TheRapingDragon
A car crash mind
FFR Veteran
 
Join Date: Aug 2005
Posts: 9,787
Default Re: Help with my physics...

When I checked it I got 911, it's a conspiracy.
TheRapingDragon is offline   Reply With Quote
Old 09-7-2006, 07:57 PM   #5
lbinator
FFR Player
 
lbinator's Avatar
 
Join Date: Dec 2004
Location: I live in Ontario, Canada
Age: 30
Posts: 94
Send a message via MSN to lbinator
Default Re: Help with my physics...

Quote:
Originally Posted by Reach
hmm, well, logically, the average can't possibly be 550 since the plane doesn't go any slower than 850 mph XD

It's wrong.


Your answer is correct.

Wow I can't believe I didn't notice that, thanks everybody.
lbinator is offline   Reply With Quote
Old 09-7-2006, 08:03 PM   #6
Tasselfoot
Retired BOSS
Retired StaffFFR Simfile AuthorFFR Veteran
 
Tasselfoot's Avatar
 
Join Date: Jul 2003
Location: Widget Heaven
Age: 36
Posts: 25,184
Send a message via AIM to Tasselfoot Send a message via MSN to Tasselfoot Send a message via Skype™ to Tasselfoot
Default Re: Help with my physics...

lol at Reach.... but yea... this is some pretty easy ****.

what I want to know is how the plane magically went from 1000km/s to 850km/s without any kind of period of acceleration change.

y'know, that 2nd part of the 3 part question with "the plane decelerated from 1000 to 850 over 1000 miles at a fixed rate of deceleration." then again, the average speed if it was a fixed deceleration would be the average of the two... meh.


I know! The plane's engines died and freefell for 6 seconds. lol. now THAT would make the problem amusing. wonder if they'd make you calculate the terminal velocity of the plane. assuming air resistance is 0, of course. but, alas, it wouldn't change the horizontal velocity. :-/.

where are our fun problems with parabolic trajectories and ledges and crap.
__________________
RIP
Tasselfoot is offline   Reply With Quote
Old 09-7-2006, 09:33 PM   #7
TheRapingDragon
A car crash mind
FFR Veteran
 
Join Date: Aug 2005
Posts: 9,787
Default Re: Help with my physics...

Quote:
Originally Posted by Tasselfoot
what I want to know is how the plane magically went from 1000km/s to 850km/s without any kind of period of acceleration change.
Quote:
It then encounters a headwind that slows it down to 850km/h
Is that not why?
TheRapingDragon is offline   Reply With Quote
Old 09-7-2006, 09:45 PM   #8
Tasselfoot
Retired BOSS
Retired StaffFFR Simfile AuthorFFR Veteran
 
Tasselfoot's Avatar
 
Join Date: Jul 2003
Location: Widget Heaven
Age: 36
Posts: 25,184
Send a message via AIM to Tasselfoot Send a message via MSN to Tasselfoot Send a message via Skype™ to Tasselfoot
Default Re: Help with my physics...

it would still be gradual.... unless we have like, the Wind of God pushing into it or something.
__________________
RIP
Tasselfoot is offline   Reply With Quote
Old 09-7-2006, 09:48 PM   #9
Squeek
let it snow~
FFR Veteran
 
Squeek's Avatar
 
Join Date: Jan 2004
Age: 34
Posts: 14,457
Send a message via AIM to Squeek
Default Re: Help with my physics...

Quote:
Originally Posted by TheRapingDragon
Is that not why?
Nothing is instantaneous in an analogue world.

There's a reason straight lines are banned from graphs of functions in mathematics. That's instantaneous motion assuming the X-axis represents time.
Squeek is offline   Reply With Quote
Old 09-9-2006, 07:42 PM   #10
Reach
FFR Simfile Author
Sectional ModeratorFFR Simfile AuthorFFR Veteran
 
Reach's Avatar
 
Join Date: Jun 2003
Location: Canada
Age: 33
Posts: 7,462
Send a message via AIM to Reach Send a message via MSN to Reach
Default Re: Help with my physics...

Straight lines are BANNED?

lmao.

They just don't exist, since a slope of infinity is not possible.

B&
__________________
Reach is offline   Reply With Quote
Old 09-9-2006, 07:48 PM   #11
Kit-
Private College
FFR Simfile AuthorFFR Veteran
 
Kit-'s Avatar
 
Join Date: Feb 2006
Location: Lol badger
Posts: 536
Default Re: Help with my physics...

Quote:
Originally Posted by Squeek
Nothing is instantaneous in an analogue world.

There's a reason straight lines are banned from graphs of functions in mathematics. That's instantaneous motion assuming the X-axis represents time.
Unless, of course, we believe in the Planck Postulate.
__________________
<img src="Bent Lines" />
Kit- is offline   Reply With Quote
Old 09-9-2006, 08:03 PM   #12
Squeek
let it snow~
FFR Veteran
 
Squeek's Avatar
 
Join Date: Jan 2004
Age: 34
Posts: 14,457
Send a message via AIM to Squeek
Default Re: Help with my physics...

Quote:
Originally Posted by Reach
Straight lines are BANNED?

lmao.

They just don't exist, since a slope of infinity is not possible.

B&
Ya, they're b&

Using terminology everyone can understand here.
Squeek is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 11:40 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright FlashFlashRevolution