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Homework Help: Rates of Change - Is this answer correct?

  1. Oct 13, 2011 #1
    1. The problem statement, all variables and given/known data

    A droplet of oil is placed at the bottom of a circular container of radius(R)= 50m so that it is in the centre. If the radius (r) of the droplet is increasing at a constant rate of 0.5ms^-1. How long will it take for the droplet to reach the sides of the container i.e.when R=r.

    2. Relevant equations

    T=x/y=R/r where T=time, x=radius of container, y=radius of droplet.

    3. The attempt at a solution

    t=50/0.5=100s?

    I don't do maths so I thought maybe you guys could help.

    Thanks a lot.
     
  2. jcsd
  3. Oct 15, 2011 #2
    If you walk a half a meter per second how far will you go in 1, 10, and 100 seconds?

    .5m, 5m, 50m ?

    You don't do math, you just did math!
     
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