# Oxygen Usage Graph

- Author:
- Victoria M Lowery

## Enter your equations in the input bar on the left.

## Question 1

The Extra - Vehicular Activities (EVA) officer needs to ensure that each astronaut can complete the seven hour spacewalk before their oxygen is depleted. Based on your graph, will each of the astronauts be able to complete the seven hour space walk before running out of oxygen?

## Question 2

Approximately how long will it take each astronaut to deplete all of their oxygen? (Make sure to enter a value for Astronaut 1 and a value for Astronaut 2)

## Question 3

How could you have answered questions 1 and 2 without using the graph? EXPLAIN

## Question 4

Convert your answers from question 2 into hours and minutes (Make sure to enter a value for Astronaut 1 and a value for Astronaut 2)

## Question 5

Plot your answers from question 2 as points on the graph (use the point tool). What are the points called and what do they represent?

## Question 6

Plot the y - intercept for both functions (use the point tool). What do those points represent in the context of the situation?

## Question 7

Using the point tool, plot a point where the two functions intersect with each other. What are the coordinates of that point? What does that point represent in the context of the situation? Be as specific as possible.

## Question 8

Three hours into the spacewalk, Astronaut 1 has become exhausted. The EVA officer recommends that the two astronauts switch duties. How much oxygen pressure does each astronaut have left at this point? (Make sure to enter a value for Astronaut 1 and Astronaut 2)

## Question 9

Write two new equations to represent the oxygen pressure for each astronaut after switching roles. Since Astronaut 1 bow has a lighter workload and Astronaut 2 now has a more strenuous workload, their rates of oxygen use will be reversed. (Make sure to write a new equation for Astronaut 1 and for Astronaut 2)

## Question 10

The EVA officer has recommended that the spacewalk be aborted if either astronaut reaches an oxygen pressure of 150 psi before the mission is complete. If 4 more hours are required to complete the EVA, will the astronauts be able to finish the spacewalk? Be specific.