Physics Help Forum Forces acting on a moving object
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 Dec 4th 2011, 03:29 AM #1 Junior Member   Join Date: Apr 2010 Posts: 12 Forces acting on a moving object A 28800 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (-187i + 363j) lb and F2 = (83i + -18j) lb. Its initial velocity is (23i + 23j) ft/s. How far is it from where it started after 33 seconds? (ft) I'm not sure where to begin with this as it doesn't resemble any other problems I'm familiar with. Any help is much, much appreciated.
 Dec 4th 2011, 11:03 PM #2 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 Find the resultant force in terms of i and j (it's simple vector addition) From this, work out the acceleration in each direction using F = ma When you got the acceleration, use v = u + at to get the final velocity in each of the components i and j. Could you try that? __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?
 Dec 14th 2011, 11:59 PM #3 Junior Member   Join Date: Dec 2011 Posts: 4 The local freestream velocity can be determined using a CFD or by solving Laplace's equation. Some assumptions about the BL thickness can be used to make the solution more accurate. ______________ Last edited by werehk; Dec 15th 2011 at 08:09 AM.

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