The radius of a spherical ball is increasing at a rate of 2 cm/min. At what rate is the surface area of the ball increasing when the radius is 8 cm

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.7: Applications
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SOLVE FOR THE FOLLOWING RELATED RATES PROBLEMS. SHOW YOUR SOLUTIONS 

1. The radius of a spherical ball is increasing at a rate of 2 cm/min. At what rate is the surface area of the ball increasing when the radius is 8 cm?

IN EXERCISE NUMBER 2 DO THE FOLLOWING:

(a) What quantities are given in the problem?

(b) What is the unknown?

(c) Draw a picture of the situation for any time t.

(d) Write an equation that relates the quantities.

(e) Finish solving the problem. 

2. A plane flying horizontally at an altitude of 1 mi and a speed of 500 mi/h passes directly over a radar station. Find the rate at which distance from the plane to the station is increasing when it is 2 mi away from the station. 

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