Five applications of math used in the movie Apollo 13 are:
1. Space flight - math is used to calculate the course of vessels through space.
2. Communications - the Apollo 13 spacecraft communicated with Houston by radio. The equipment they used to do so could not have been constructed without mathematical calculations.
3. Keeping the crew alive - the ground crew used calculations of the amount of oxygen available, the respiration rate of the crew members, and the CO2 removing ability of the filter to keep the crew alive.
4. Solving the entry problem - a calculation of the remaining energy was required to determine the re-entry procedure.
5. Recovery - after splashdown, the module was recovered by a US Navy vessel. Math is used to plot the course of ships.
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