Turn on thread page Beta

differential equations p3 watch

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    Im having a lot of problems in setting up and solving these equations....can any1 help????
    Offline

    0
    ReputationRep:
    (Original post by ladoooo)
    Im having a lot of problems in setting up and solving these equations....can any1 help????
    Theres a list of differential equations for P1, P2 and P3 at http://www.pixelfairies.co.uk/?conte...ifferentiation if that helps
    • Thread Starter
    Offline

    0
    ReputationRep:
    I dont mean thsoe differential equations...i mean when they give u a passage and u hav 2 set up the differential eqaution...such as newtons law of cooling.
    There was a question like it in june 2003 paper....i couldnt do it

    Help anyone???
    Offline

    14
    ReputationRep:
    hum, i couldnt do a), although i looekd on ajimal and didnt have a clue. can someone explain this please?

    ive done the rest though!
    Offline

    8
    ReputationRep:
    (Original post by kikzen)
    hum, i couldnt do a), although i looekd on ajimal and didnt have a clue. can someone explain this please?
    ...
    Basically , two constants multiplied together are still a constant!

    Since the tank is emptying, then the rate (of increase) of fluid flow is negative.

    dV/dt = -K√ V, K positive

    V = πr²h
    dV/dh = πr²
    dh/dV = 1/πr²

    dh/dt = (dh/dV).(dV/dt)
    dh/dt = 1/(πr²).(-K√ V)
    dh/dt = 1/(πr²).(-K√ (πr²)√ h)
    dh/dt = -K√ h/√ (πr²)
    dh/dt = -k√ h, k a positive constant and k = K/√ (πr²)
 
 
 

University open days

  • University of Warwick
    Undergraduate Open Days Undergraduate
    Sat, 20 Oct '18
  • University of Sheffield
    Undergraduate Open Days Undergraduate
    Sat, 20 Oct '18
  • Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 20 Oct '18
Poll
Who is most responsible for your success at university

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.