Related rates of volume and area of a cube

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  • čas přidán 27. 08. 2024
  • In this video, I showed how to icompute a related rate given the rate of change of volume.

Komentáře • 41

  • @albertobuj4021
    @albertobuj4021 Před 10 měsíci +24

    I'm sure that if this guy were a professor at every high school, 90% of students would choose mathematics in college.

  • @girlthatyoufear6
    @girlthatyoufear6 Před 10 měsíci +10

    I just found your channel. I am literally watching your videos in my holiday and i love it 😅 If only i had a teacher like you, math would be so much more interesting ☺️

  • @suomynona898
    @suomynona898 Před 7 měsíci +4

    The way everything came together at the end made me smile. Maths is beautiful

  • @jdlescott4493
    @jdlescott4493 Před 7 měsíci +2

    Your tutorial on applying the fundamental principles of implicit differentiation to solve real-world problems is truly excellent. Your ability to convey complex concepts in a practical context is commendable, making it easier for learners to grasp and apply these essential mathematical techniques. Keep up the great work!

  • @casar68
    @casar68 Před 7 měsíci +1

    55 years Oldman, love maths, and love when I discover a teacher like you seem to be !
    Thanks

  • @arbenkellici3808
    @arbenkellici3808 Před 8 měsíci +1

    Excellent solution This guy is a genious in Maths I dare to compare him to Euler, Gauss and all the other great mathematician through centuries Thats it!

  • @punditgi
    @punditgi Před 10 měsíci +5

    Brilliant! 🎉😊

  • @VirKap99
    @VirKap99 Před 10 měsíci +1

    Helps a LOT. This is so well explained

  • @ramachandrakandikere245
    @ramachandrakandikere245 Před 9 měsíci +1

    Really a Nice Video on application of Derivatives as a rate measurer. Your smile is infectious❤. Your Informative Videos on Tetration, Pentation, Hexation and Graham's Number was excellent. From India.😊❤

  • @SYAgencies0379
    @SYAgencies0379 Před 10 měsíci +2

    For Shift 8 Academy, students. Brillant explanation in simplicity of how the earth time, been 2 years, ( 4 min and 4 sec off time count ). Thank you, instructor Newton, he will be great for the school. Also, understanding , why and how, the Islamic calendar is off, and not accurate, their going off Saturn , but do not equate the sun knowledge, as the natives calendar, equate Sun and Saturn, the 6/8 duo to help Venus balance time.

  • @jaikrishnay3569
    @jaikrishnay3569 Před 10 měsíci +2

    Bro l like your teaching

  • @mayanksethia4209
    @mayanksethia4209 Před 3 měsíci

    excellent expalnantion sir. Thank you so much

  • @thetajinos7790
    @thetajinos7790 Před měsícem

    Great video 😮😮🎉

  • @user-zn1je3kn9h
    @user-zn1je3kn9h Před 10 měsíci +5

    Good job 😍
    but there is a way too much easier than yours
    since that V=L³ , L=3 & dV/dt =4 cm³/min
    Therefore : dv/dt = 3L² dl/dt =4
    Therefore dl/dt = 4 /27
    And since Area of cube = 6L²
    Therefore dA/dt = 12 L dl/dt
    = (12)(3)(4/27)
    dA/dt=16/3 cm²/min

    • @user-zn1je3kn9h
      @user-zn1je3kn9h Před 10 měsíci +1

      Easiest question for Egyptian high school students 😅

    • @PrimeNewtons
      @PrimeNewtons  Před 10 měsíci +3

      That works too! You noticed I only differentiated once. That was my goal.

    • @jim2376
      @jim2376 Před 8 měsíci

      I used the method of our Egyptian friend. For me the key was finding dL/dt first. That said, the professor's method was quite creative.

  • @m.h.6470
    @m.h.6470 Před 7 měsíci +1

    The entire left side of the board is unnecessary:
    The mantle of a cube is 6 times the area of a side, which is the side length cubed.
    And since the side length (typically called a) of a cube is ³√V, you get M = 6 * ³√V² = 6V^(2/3).
    It doesn't matter, if you know any value or if it is all variable. This is just the relationship between mantle and volume of any cube - it is universal.
    Once you got that, you calculate the derivative, so M' = 4/³√V
    (6 * 2/3 * V^(2/3 - 1) = 12/3 * V^(-1/3) = 4 * 1/V^(1/3) = 4/³√V)
    This is the rate of change between the volume and the mantle.
    But ³√V, as we said earlier, is just the side length, so we can write it as M' = 4/a.
    This means however, that the rate of expansion of the Area is dependent on the original side length of the cube.
    Unfortunately this is what makes this task so ridiculous: Since we are given a change rate over time, this rate is literally only valid for less than a femto second, as the moment the cube grows, the side length of the cube changes and the entire calculation would have to be done again.
    In other words, it is completely useless to calculate the rate of change of the mantle to the cube over time, as it changes constantly. It is not a fixed value!

  • @frndlynemy
    @frndlynemy Před 9 měsíci +2

    Sir, please show more videos on different types of Related Rate problems like ladder problem etc.

    • @PrimeNewtons
      @PrimeNewtons  Před 9 měsíci +1

      Search my channel. I already have those videos

  • @apriljohnson6191
    @apriljohnson6191 Před 9 měsíci +1

    Thank you!!!

  • @holyshit922
    @holyshit922 Před 10 měsíci +1

    What about your series of algebra videos
    I dont know what should be next (I am not a teacher)
    but I would like to see video about similar matrices , characteristic polynomial ,eigenvalues and eigenvectors , Cayley-Hamilton theorem , some matrix decomposition like diagonalization , Jordan form and maybe SVD

  • @FahimMohtasim
    @FahimMohtasim Před 10 měsíci +1

    Bro I am very weak in calculatas. Make a video on this topic.

  • @vee985
    @vee985 Před 28 dny

    Impressive

  • @AubreyForever
    @AubreyForever Před 10 měsíci +1

    Thank you. This may be even hard for a math graduate who hasn't studied math for many years.

    • @kristianbojinov6715
      @kristianbojinov6715 Před 7 měsíci +1

      How would a grad in any field not have studied for many years?

    • @AubreyForever
      @AubreyForever Před 7 měsíci

      What are you talking about? I know many people like this. Are you a troll?@@kristianbojinov6715

  • @dreamofkinggaming
    @dreamofkinggaming Před 10 měsíci +2

    You Can Also Solve It Like This If I'm Wrong Then Sorry
    1. Assume H & B In Cube
    2. In volume get The value of x
    3. Put This x value in Ar. Equation (If Getting Simplified The Simplify)
    4. Now Differentiate It
    5. Put Differentiate equal to 0
    6. Now Solve It U Shall Get Answer.

  • @Stender_
    @Stender_ Před 10 měsíci +1

    I was thinking about a similar problem in calc today 🤔

  • @boguslawszostak1784
    @boguslawszostak1784 Před 7 měsíci +1

    A(x)=6x^2
    so:
    dA(x)/dt= 12*x*dx=4*(3*x*dx/dt) (1)
    V(x)=x^3
    so:
    dV/dt=3x^2*dx/dt
    (we will need 3*x*dx/dt)
    3*x*dx/dt=(1/(x))*dv/dt (2)
    after substitution (2) to (1) we get:
    dA(x)/dt= 4*(1/x)*dv/dx
    for x=3 and dV/dt= 4
    dA/dt=16/3

  • @giancarlolosciale1
    @giancarlolosciale1 Před měsícem

    dA/dt = 4/s* dV/dt, but the value of s is a function of time. How do you replace it with a constant value?

  • @florianbasier
    @florianbasier Před 5 měsíci

    you can also go straight dV/dt=3x2.dx/dt=4 so dx/dt=4/(3x2) and dA/dt=12x.dx/dt=16/x=16/3 when x=3

    • @clayton97330
      @clayton97330 Před 4 měsíci

      Yep, was looking for this comment

  • @VanNguyen-kx6gx
    @VanNguyen-kx6gx Před 8 měsíci +1

    Good

  • @skwbusaidi
    @skwbusaidi Před 3 měsíci

    We can first find dx/dt
    V=x^3
    dv/dt = 3 x^2 dx/dt
    4= 3 (3)^2 dx/d
    dx/dt = 4/27
    A = 6 x^2
    dA/dt = 12x dx/dt
    = 12 × 3 × 4/27
    =16/3

  • @jaypee2558
    @jaypee2558 Před 8 měsíci +1

    Let V = s^3, dV/dt = 3s^2 * ds/dt.
    Then let A = 6s^2, dA/dt = 12s * ds/dt
    ds/dt = 1/3s^2 * dV/dt
    Then, dA/dt = 12s * 1/3s^2 * dV/dt = 4/s * dV/dt
    So, dA/dt = 4/3 * 4 = 16/3

  • @berndmayer3984
    @berndmayer3984 Před 4 měsíci

    typical mathematical approach. more physically with V(t) , O(t) would be dO/dt (27/4) =

  • @casar68
    @casar68 Před 7 měsíci

    Merci !