Question

Asked Dec 3, 2019

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You and your friends are designing and constructing a cone-shaped funnel. Whatever you use this funnel for is up to you. You decide that the height of the funnel will be 6 inches.

(a) What does the radius of the base of the funnel need to be if you want the volume of it to be 69 inches cubed? (V = 1/3 πr 2h, where r is the radius of the circular base, and h is the height.)

(b) You finally construct it, with the correct height and radius, and you pour the liquid into it to test it out. Again, the choice of liquid and the reason you are doing this is up to you. In measuring the effectiveness of the funnel, you determine that as the liquid flows out of the bottom, the radius of the liquid as it’s in the funnel is decreasing at a rate of 1 inch per second, and the height is decreasing at a rate of 1.75 inches per second. Find the rate at which the volume of the liquid (in inches cubed per second) is decreasing.

(c) How many seconds will it take for the funnel to be empty at this rate?

Step 1

Part (a):

Let ** r** is the radius and

Volume of the cone shaped funnel:

Step 2

Part (b):

It is given that the height is decreasing at a rate of 1.75 inches per second. The radius of the liquid is decreasing at a ...

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