Recent content by andymcl2000

  1. A

    Related rates, sphere is decreasing diameter, how fast is volume decreasing?

    A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 12 cm?
  2. A

    Related rates, boat being pulled into a dock. Calculus?

    A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1.5 m/s, how fast is the boat approaching the dock when it is 9 m from the dock?
  3. A

    Related rates, circule with increasing radius, how is area changing?

    Let A be the area of a circle with radius r. If (Dr/Dt) = 3, find (Da/Dt) when r = 2
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