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Elementary Principles of Chemical Processes | 4th Edition | ISBN: 9780470616291 | Authors: Richard M. Felder Ronald W. Rousseau, Lisa G. Bullard
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In the Pixar film, Up, Carl Fredrickson turns his house into a makeshift airship using

Chapter 5, Problem 5.17

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QUESTION:

In the Pixar film, Up, Carl Fredrickson turns his house into a makeshift airship using helium balloons. (a) Neglecting the force required to remove the house from its foundation, how many spherical balloons, each having a 9.5-inch diameter and an interior gas pressure of 1.05 atm, would Carl have to tie to his house for it to float? Assume that the house weighs 1:00 105 lbf, and that atmospheric pressure and temperature are 1.0 atm and 25C. (b) The original version of this problem assumed that the pressure in the balloons also was 1.0 atm. Why must the balloon pressure be greater than that?

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QUESTION:

In the Pixar film, Up, Carl Fredrickson turns his house into a makeshift airship using helium balloons. (a) Neglecting the force required to remove the house from its foundation, how many spherical balloons, each having a 9.5-inch diameter and an interior gas pressure of 1.05 atm, would Carl have to tie to his house for it to float? Assume that the house weighs 1:00 105 lbf, and that atmospheric pressure and temperature are 1.0 atm and 25C. (b) The original version of this problem assumed that the pressure in the balloons also was 1.0 atm. Why must the balloon pressure be greater than that?

ANSWER:


A) Carl would need to tie 1,820 balloons to his house for it to float.

B) The balloon pressure needs to be gre

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