Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Mimi_x3
Group Title
Only for Kaffeine, easy one first.
The cost to run a vehicle is a + v^2/a dollars per hour where v is the average speed of the vehicle in km/h. Show thatt the cost for a trip of Dkm is lowest if the vehicle travels at v=a km/h
 3 years ago
 3 years ago
Mimi_x3 Group Title
Only for Kaffeine, easy one first. The cost to run a vehicle is a + v^2/a dollars per hour where v is the average speed of the vehicle in km/h. Show thatt the cost for a trip of Dkm is lowest if the vehicle travels at v=a km/h
 3 years ago
 3 years ago

This Question is Closed

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Do you want the work to? O_o
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
nope, wait its a show question. Just show the working if you're bothered.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Okay sorry, the stupid thing said server lost connection C = a + v2/a => dc/dv = 0 + 2v/a => dc/dv = 2v/a => 2v /a = 0 2v = 0(a) v = 0 => d2c / dv2 = d/v(2v/a)= 2/a (Postive value so cost is lowest for all values of v ) ??
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Sorry, its wrong.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
K give me a moment.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
You can ask for help if you want, i don't mind.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Omfg Mimi.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
lols, what's wrong ? Archaic Mathematician can help :P
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
This is basic calc (calc 1), i wanna see her do this.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Isn't calc 1 ? college ? >_<
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
she can do it, i am sure. She solved harder ones before
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
ok, i'll give a little hint, it involved d s t
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
c(a) = 2v?? don't tell me I am wrong again. _
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
lols, yeah sorry. Want me to type up the solution ?
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Lol Give me the answer and I ll figure the solution
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
no way
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
It's a show.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Lagrange, stay out of it, and go away.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Mimi, type.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Archaic mathematician can help you.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
I ll figure it out myself.
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
hard headed ^
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
lols, and stubborn _
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Shut up featheres.
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
lets get some soap for that mouth
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Please refrain from swearing, don't get angry man.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Lol You have no control over my fingers, so no use in stating stop :P Please feel free to hit the report abuse button =) It will be a donation
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Hm...dw about the problem, I'll type up the solution if you want.
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
yeah, put her out her misery
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
lols, yeah i feel bad.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Didn't I say I ll figure it out on my own?
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
It'll take a while, it took me a while.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Doesn't matter. I have a brain gifted to me for it.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Okay, do it as you wish, don't need to give me the solution straight away.
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
yeah, let her use "her" brain to find the solution
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Lagrange, how many effing times Have I told you to stay away from me? Gosh damn.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
lols, dont be mean :P
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Kaffeine is pissed off
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
woah, relax buddy
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
take a chill pill
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Get a life dude, other than critizing me each time I solve a calc problem.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
You crossed the limits a while ago, and I told you to STAY AWAY
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
nobody is criticizing you, i just find it weird that you can solve problems i give you, that are straight from calc 2, but you cant solve this one
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
You are making it sound so serious. Don't worry about it. I'll take up the solution.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Lol Does a person have be good at calc 1 to get into calc bc? Your derivative questions are easy as hell.
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Time to travel D km T = D / S = D / V (hours) Cost to travel D km C = T * ( a + v^2/a ) = D / v ( a + v^2 / a ) = D ( a/v + v/a) dC / dt = D( a/v^2 + 1/a) = 0 a/v^2 + 1/a = 0 1/a = a/v^2 v^2 = a^2 > a km/h check for minimum: (using second derivative) d^2C/dt^2 = D(2a/v^3 + 0) = D * 2a/a^3 = 2D/a^2 > 0 yes, the cost at v=a is the lowest. Therefore v=a km/h for lowest cost.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Damn. forgot to plug it into the equation
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Yeah and you forgot about the distance.
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
Pellet >.>
 3 years ago

KatrinaKaif Group TitleBest ResponseYou've already chosen the best response.0
I used the distance to get my 2 values in the first one..Forgot all about it
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Yeah, when i did it I forgot about the other one as well xD
 3 years ago

LagrangeSon678 Group TitleBest ResponseYou've already chosen the best response.1
it was a nice try
 3 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.6
Want an easier one kaffeine ?
 3 years ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
This is all hilarious @Mimi_x3 @LagrangeSon678 @KatrinaKaif
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.