Section 3.6 Recap

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# Section 3.6 Recap - PowerPoint PPT Presentation

Section 3.6 Recap. Derivatives of Inverse Functions. Our Main Focus . Additional 3.6 Example. Find . What We’ve Learned Thus Far. Section 3.7. Related Rates.

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### Section 3.6 Recap

Derivatives of Inverse Functions

### Section 3.7

Related Rates

When water is drained out of a conical tank the volume V, the radius r, and the height h of the water level are all functions of time t.

Let’s say the circle given by the equation

is changing with respect to time. Hence, both and are functions of time, . What is ?

Example 1

A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius r of the outer ripple is increasing at a constant rate of 1 foot per second. When the radius is 4 feet, at what rate is the total area A of the disturbed water changing.

Example 2

Air is being pumped into a spherical balloon at a rate of 4.5 cubic feet per minute. Find the rate of change of the radius when the radius is 2 feet.

Example 3

Assume that and are both differentiable functions of t and find the required values.

Example 4

A point is moving along the graph such that is centimeters per second. Find for the given x value.

Example 5

The radius r of a sphere is increasing at a rate of 3 inches per minute. Find the rate of change of the volume when inches.

Example 6

All edges of a cube are expanding at a rate of 6 centimeters per second. How fast is the volume changing when each edge is 10 centimeters?

Example 7

Using example 6, how fast is the surface area changing when each edge is 10 cm?

Example 8

A conical tank with vertex down is 10 ft. across the top and 12 feet deep. If water is flowing into the tank at a rate of 10 cubic ft. per minute, find the rate of change of the depth of the water when the water is 8 ft. deep.

Example 9

A fish is reeled in at a rate of 1 foot per second from a point 10 feet above the water. At what rate is the angle between the line and the water changing when there is a total of 25 feet of line from the end of the rod to the water?

Concept Check

Let be the area of a circle of radius that is changing with respect to time. If is constant, is constant?

Concept Check

Consider the linear function . If changes at a constant rate, does change at a constant rate? If so, does it change at the same rate as ?

Questions?
• Remember to be working the practice problems.