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Posted by **Kendall** on Tuesday, January 3, 2012 at 6:17pm.

Calculate how long a de-orbit burn must last in minutes and seconds to achieve the Shuttle’s change in altitude from 205 miles to 60 miles at perigee.

- Physics -
**Eric**, Tuesday, February 5, 2013 at 12:07amMethod 1

Step 1: Solve for acceleration

From F=ma, rearrange to a=F/m

a=F/m= (53000 N)/(1.13 x 〖10〗^5 kg)= .469026549 〖m/s〗^2

Step 2: Solve for time

t=∆v/a=(88.4 m/s)/(.469026549 〖m/s〗^2 )=188.4754716 seconds

Step 3: Convert seconds to minutes

(188.4754716 seconds)/60=3.141257859 minutes

Step 4: Convert minutes to seconds

.141257859 × 60=8.47547154 seconds

Final answer:

It would require 3 minutes and 8 seconds of burn time to change the Shuttle’s altitude from 205 miles to 60 miles at perigee.

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