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Homework Help: Acceleration - Rocket 1d Kinematics

  1. Oct 11, 2006 #1
    Acceleration -- Rocket 1d Kinematics

    NASA has developed Deep-Space 1 (DS-1), a spacecraft that is scheduled to rendezvous with the asteroid named 1992 KD (which orbits the sun millions of miles from the earth). The propulsion system of DS-1 works by ejecting high-speed argon ions out the rear of the engine. The engine slowly increases the velocity of DS-1 by about 19.0 m/s per day.

    (a) How much time (in days) will it take to increase the velocity of DS-1 by 13000 m/s?
    684.21 days

    (b) What is the acceleration of DS-1 (in m/s2)?

    I got the days, but I can't find the acceleration, what am I missing?

    I have tried to do 19.0 * 86400 which is how many seconds in one day.. and that doesnt work.. I have tried other things but too many things to list.
  2. jcsd
  3. Oct 11, 2006 #2


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    Look again at the definition of acceleration. Look at your product. Are they consistent? It's a good habit to keep your units as you work through a problem. It will help you to know when your operations are not correct.
  4. Oct 11, 2006 #3
    Average Acceleration is [tex] \Delta x / \Delta t[/tex]

    but is this average acceleration?

    45 minutes to get these last three figured out ;).
  5. Oct 11, 2006 #4

    I got 15 min :-p
  6. Oct 11, 2006 #5


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    Average Acceleration is [tex] \Delta v / \Delta t[/tex]
    In your earlier post, you calculated [tex] \Delta v * \Delta t[/tex]
  7. Oct 11, 2006 #6
    Thanks, assignment is past due but I'm still gonna try and figure out, I'll just miss this problem, still an A no big deal.
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