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Homework Help: Help with Newton Question

  1. Oct 13, 2012 #1
    1. The problem statement, all variables and given/known data

    A tank in the form of a right-circular cone standing on end with its vertex down, is leaking water through a hole its circular bottom.

    • a. Suppose the tank is 20 feet high moreover has a radius 8 feet wide moreover the circular hole has a radius 2 inches. In problem 1.3 you were asked to demonstrate that the differential equation governing the height h of water leaking from a tank is

      dh/dt = -5/6h3/2

      In this model, friction as well as contraction of the water at the hole were taken into account with c = 0.3, moreover that g was taken to be 32 ft/s2. If the tank was initially full, how long shall it take the tank to empty?

      b. Suppose the tank has a vertex angle of 60o in addition that the circular hole has a radius of 2 inches. Determine the differential equation governing the height h of water. Use c = 0.6 as well as g = 32 ft/s2. If the height of the water is initially 9 feet, how long will it take the task to empty?

    2. Relevant equations

    dh/dt = -5/6h3/2

    3. The attempt at a solution

    Not yet. I just came into this site after being referred to by a friend, moreover I seriously need help in differential equations. Can someone help?
  2. jcsd
  3. Oct 14, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF;
    Solving the differential equation seems to be a matter of integration - applying the initial value.

    I look forward to seeing your initial attempts at the problem.
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