10-12. Suppose y varies jointly as x & z. If y = -180 when z = 15and x = -3,then find y when x = 7 and z = -5. * (Show solution)   *-140 *140 *-4 * 4   13-15. The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 65 miles per hour? * (Show solution)   *308.05 ft *295.75 ft *296.09 ft *253.5 ft

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Answer each of the following questions involving direct, inverse, joint, and combined variations. Choose your answer from the given choices. For items number 10-15, attach a copy of your solutions in this form.

 

1. What type of variation involves 3 or more quantities that may vary directly? *
 
*Direct Variation
*Inverse Variation
*Joint Variation
*Combined Variation
 
2. This type of variation states that the two quantities increase at the same time or decrease at the same time. *
 
*Direct Variation
*Inverse Variation
*Joint Variation
*Combined Variation
 
3. Translate "the cost c varies directly as the number of n pencils" into equation. *
 
*c = kn
*k = cn
*n = k/c
*c = k/n

4. The speed r of a moving object is inversely proportional to the time t travelled is written as *
 
*r = kt
*r = k/t
*t = kr
*t = r/k

5. Which of the following types of variation states that the decrease of one quantity results to the increase of the other quantity? *
 
*Direct Variation
*Inverse Variation
*Joint Variation
*Combined Variation
 
6. If y varies directly as x and y = 24, when x = 3, then what is the value of k? *
 
*4
*6
*8
*12
 
7. Which of the following phrases illustrate an inverse variation? *
 
*The area of the wall to the amount of paint used to cover it
*The amount of money raised in a concert to the number of tickets sold
*The time a teacher spends in checking papers to the number of students
*The age of a used car to its resale value
 
8. If s varies directly as t and inversely as v, then which of the following equations describes the relation among the three variables s, t, and v? *
 
*s = k / tv
*s = kv / t
*1/s = kt/ v
*s = kt / v
 
9. This is a variation where one quantity varies directly to other quantity and inversely to the other quantity. *
 
*Direct Variation
*Inverse Variation
*Joint Variation
*Combined Variation
10-12. Suppose y varies jointly as x & z. If y = -180 when z = 15and x = -3,then find y when x = 7 and z = -5. * (Show solution)
 
*-140
*140
*-4
* 4
 
13-15. The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 65 miles per hour? *
(Show solution)
 
*308.05 ft
*295.75 ft
*296.09 ft
*253.5 ft
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