Calculus Related Rates Interesting Problem

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SUMMARY

The forum discussion revolves around solving a calculus-related rates problem involving the volume of a leaking balloon. The user has successfully solved the first two parts, yielding answers of π cm/second for the rate of change of circumference and 50π cm³/second for the rate of change of volume. The third part presents a challenge regarding the volume of a balloon with a decreasing circumference at a rate of 1/8 cm per second, leading to confusion about the multiple variables involved. The discussion emphasizes the importance of understanding the relationships between volume, circumference, and their rates of change.

PREREQUISITES
  • Understanding of calculus concepts, specifically related rates
  • Familiarity with the volume formula for a sphere: V=4/3(pi)r^3
  • Knowledge of differentiation and its application in real-world problems
  • Ability to manipulate equations involving multiple variables
NEXT STEPS
  • Study the application of related rates in calculus using examples similar to the balloon problem
  • Learn how to derive and apply the formula for the volume of a sphere in practical scenarios
  • Explore techniques for solving complex problems with multiple variables in calculus
  • Practice problems involving the differentiation of volume and circumference in relation to time
USEFUL FOR

This discussion is beneficial for students studying calculus, particularly those focusing on related rates, as well as educators looking for practical examples to illustrate these concepts.

Gregarious101
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Homework Statement



http://www.kent.k12.wa.us/pcpow/questions/calc/0401trickortreat/index.html

This is an old problem, and I have been able to solve one and two, I believe the answers are

1. pi cm/second
2. 50(pi) cm^3/second
3. This is the one I am not sure of. How can I solve this? Isn't there two many variables?

Homework Equations



V=4/3(pi)r^3
dV/dt= 2(pi)r^2
dC/dt= (2(pi))*cube root(V/(4/3(pi)))*(1/(4/3(pi)))*(dV/dt)




The Attempt at a Solution



I am getting lost at three, the rest are pretty easy, I think.

THANK YOU!
 
Last edited by a moderator:
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Welcome to PF!

Hi Gregarious101! Welcome to PF! :smile:

(have a pi: π and try using the X2 tag just above the Reply box :wink:)
Gregarious101 said:
I am getting lost at three, the rest are pretty easy, I think.

3. The balloons are all full now and the kids are ready to go. A little boy named Billy grabs a water balloon but realizes the he’s already getting wet even though no balloon has been tossed. Billy looks down at his balloon.
OH NO! There is a small leak in his balloon. The circumference is decreasing at a rate of 1/8 cm per second.
If the balloon is empty after five minutes, what was the volume of the balloon before it began to leak (round to three decimal places)?

Just do it the other way …

The circumference is increasing at a rate of 1/8 cm per second: if it starts empty, what its it after five minutes?
 

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