2. A 15 foot ladder is resting against the wall. The bottom is initially 10 feet away from the wall and is being pushed towards the wall at a rate of 1/4 ft/sec. How fast is the top of the ladder moving up the wall 12 seconds after we start pushing?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 17E
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Solve 2

1:14 PM Fri Mar 19
* 85%
Done <
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Homework for 3.9
Cal I Due Friday, March 19
Name
1. Air is being pumped into a spherical balloon at a rate of 4 cm³/min. Determine the rate at which the radius of
the balloon is increasing when the diameter of the balloon is 28 cm.
Solution:
2. A 15 foot ladder is resting against the wall. The bottom is initially 10 feet away from the wall and is being
pushed towards the wall at a rate of 1/4 ft/sec. How fast is the top of the ladder moving up the wall 12 seconds
after we start pushing?
3. A tank of water in the shape of a cone is leaking water at a constant rate of 2 ft3/hour. The base radius of
the tank is 5 ft and the height of the tank is 14 ft. At what rate is the depth of the water in the tank changing
when the depth of the water is 6 ft?
Bonus:
A spot light is on the ground 20 ft away from a wall and a 6 ft tall person is walking towards the wall at a
rate of 2.5 ft/sec. How fast is the height of the shadow changing when the person is 8 feet from the wall? Is
the shadow increasing or decreasing in height at this time?
Wall
h
Person
a
d
Spotlight
20
Transcribed Image Text:1:14 PM Fri Mar 19 * 85% Done < learn.xula.edu Homework for 3.9 Cal I Due Friday, March 19 Name 1. Air is being pumped into a spherical balloon at a rate of 4 cm³/min. Determine the rate at which the radius of the balloon is increasing when the diameter of the balloon is 28 cm. Solution: 2. A 15 foot ladder is resting against the wall. The bottom is initially 10 feet away from the wall and is being pushed towards the wall at a rate of 1/4 ft/sec. How fast is the top of the ladder moving up the wall 12 seconds after we start pushing? 3. A tank of water in the shape of a cone is leaking water at a constant rate of 2 ft3/hour. The base radius of the tank is 5 ft and the height of the tank is 14 ft. At what rate is the depth of the water in the tank changing when the depth of the water is 6 ft? Bonus: A spot light is on the ground 20 ft away from a wall and a 6 ft tall person is walking towards the wall at a rate of 2.5 ft/sec. How fast is the height of the shadow changing when the person is 8 feet from the wall? Is the shadow increasing or decreasing in height at this time? Wall h Person a d Spotlight 20
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