📚

 > 

♾️ 

 > 

👀

4.5 Solving Related Rates Problems

1 min readjune 8, 2020

Meghan Dwyer

Meghan Dwyer

Meghan Dwyer

Meghan Dwyer


AP Calculus AB/BC ♾️

279 resources
See Units

🎥Watch: AP Calculus AB/BC - Related Rates

Special Example: Volume of a Cone

The volume of a cone is a special related-rates case because of its two variables that are both rates, radius and height. In a cylinder, the radius is not a problem because it never changes. However, with a cone, as the height changes, the radius will too! Because of this, the VERY FIRST thing you should do when given a cone, is making a proportion between radius and height, and solve for the one that is unneeded to plug it into the volume formula before you do anything else!
Here is an example:
A conical water tank with vertex down has a radius of 8 ft at the top and is 22 ft high. If the water flows into the tank at a rate of 10 ft^3/min,  How fast is the depth of the water increases when the tank is 12 ft deep?
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2FScreenshot%20(490).png?alt=media&token=2bcf0610-81f9-451b-8daf-3eab33b87b50
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2FScreenshot%20(492).png?alt=media&token=2e8ca6a2-33e8-461b-9bca-1df1501d4ce8
** Remember, always round to 3 decimal places!
Browse Study Guides By Unit
👑Unit 1 – Limits & Continuity
🤓Unit 2 – Fundamentals of Differentiation
🤙🏽Unit 3 – Composite, Implicit, & Inverse Functions
Unit 5 – Analytical Applications of Differentiation
🔥Unit 6 – Integration & Accumulation of Change
💎Unit 7 – Differential Equations
🐶Unit 8 – Applications of Integration
🦖Unit 9 – Parametric Equations, Polar Coordinates, & Vector-Valued Functions (BC Only)
Unit 10 – Infinite Sequences & Series (BC Only)
🧐Multiple Choice Questions (MCQ)
✍️Free Response Questions (FRQ)
📆Big Reviews: Finals & Exam Prep