Help Neede On Related Rates (conical Cistern)

In summary, water is pouring into a conical cistern at a rate of 8ft^3/min and the cistern has a height of 12ft and a radius of 6ft. To determine how fast the water level is rising when the water is 4ft deep, one must understand the equation for the volume of a cone in terms of height and radius, as well as the relationship between height and radius in a cistern that is 12ft high and has a radius of 6ft. One must also know how to convert a static formula for volume into a rates formula to calculate the rate of change.
  • #1
marts237
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At a rate of 8ft^3/min, water is pouring into a conical cistern, if the height of a cistern is 12ft and the radius of it's circular opening is 6ft, how fast is the water level rising when the water is 4ft deep?
 
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  • #2
Having someone do the problem for you is not "help". What have you done? Do you know the equation for the volume of a cone in terms of height and radius? Do you see the relationship between height and radius of the water at any time in a cistern that is "12 ft high and radius 6 ft"? (draw a picture and think "similar triangles".)

Do you know how to go from a "static" formula (volume of cone) to a "rates" formula (how fast volume is changing)?
 

Related to Help Neede On Related Rates (conical Cistern)

What is a conical cistern?

A conical cistern is a type of storage tank or container that has a circular base and a conical-shaped top. It is commonly used for storing liquids such as water or oil.

How are related rates used in conical cistern problems?

Related rates are used to calculate the rate of change of a particular variable in a conical cistern problem. This can include the rate at which the water level is changing, the rate at which the volume is changing, or the rate at which the surface area is changing.

What information is needed to solve a related rates problem involving a conical cistern?

To solve a related rates problem involving a conical cistern, you typically need to know the height of the cistern, the radius of the base, and the rate at which a specific variable is changing (such as the water level or the volume).

What are some common real-life applications of related rates in conical cisterns?

Related rates in conical cisterns can be applied in various real-life scenarios, such as calculating the rate at which water is being pumped into or drained from a cistern, determining the time it takes for a cistern to fill, or estimating the amount of water needed to fill a cistern to a certain level.

What strategies can be used to solve related rates problems involving conical cisterns?

Some common strategies for solving related rates problems involving conical cisterns include drawing a diagram, labeling all given and unknown variables, setting up an equation that relates the variables, and using the chain rule to differentiate the equation with respect to time.

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