Depth/tank/rate of change problem

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In summary, the problem involves a conical tank with a 10-foot diameter and 12-foot depth, with water flowing in at a rate of 10 cubic feet per minute. The task is to find the rate of change of the water depth when the water is 8 feet deep. To solve this problem, one would need to apply the formula for the volume of a cone and use similar triangles to relate the height and radius of the cone. Then, differentiate the volume with respect to time to find the desired rate of change.
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doogerjr
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Homework Statement


A conical tank, (with vertex down) is 10 feet across the top and twelve feet deep. If water is flowing into the tank at a rate of 10 cubic feet per minute, find the rate of change of the depth of the water when the water is 8 feet deep.


Homework Equations

? :frown:



The Attempt at a Solution

? :bugeye:
 
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  • #2
Have you made any attempt to solve this problem at all? Surely, if someone expects you to do this problem, they expect you to know some basic formulas and some concepts of "related rates".

A very relevant equation would be the volume of a cone of radius R and height h. Also, as the water level goes up, both R and h change. Here's my recomendation: draw a picture, a triangle with base (at the top) of length 10ft and altitude (downward) 12 feet. Now draw a horizontal line across the triangle representing the surface of the water. You can get a relation between h and R using "similar triangles". Replace R by that function of h so you have the volume as a function of h only and differentiate to get dV/dt depending on dh/dt.
 

1. What is the depth/tank/rate of change problem?

The depth/tank/rate of change problem is a mathematical and scientific concept that involves finding the rate at which a container or tank is filling or emptying given the dimensions and rate of change of the liquid inside.

2. How is the depth/tank/rate of change problem used in real life?

The depth/tank/rate of change problem has many real-life applications, such as calculating the flow rate of a liquid in a pipe, determining the rate of change of water levels in a reservoir, or predicting the rate of filling or draining of a swimming pool.

3. What are the key variables involved in the depth/tank/rate of change problem?

The key variables in the depth/tank/rate of change problem include the dimensions of the container or tank, the initial and final depths of the liquid, and the rate of change of the liquid, which can be in terms of volume or depth per unit time.

4. What formulas are used to solve the depth/tank/rate of change problem?

The formulas used to solve the depth/tank/rate of change problem depend on the specific scenario and variables involved. Some common formulas include the volume of a cylinder (V = πr²h) and the rate of change formula (dV/dt = πr²dh/dt).

5. What are some common mistakes or challenges when solving the depth/tank/rate of change problem?

Some common mistakes when solving the depth/tank/rate of change problem include using the wrong formulas, not converting units correctly, and not considering the changing dimensions of the container or tank. It is important to carefully read and understand the problem, identify the given and unknown variables, and use appropriate formulas and units to solve the problem accurately.

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