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Thread: Relative velocity -vectors

  1. #1 Relative velocity -vectors 
    Forum Ph.D. Heinsbergrelatz's Avatar
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    i tried to solve this but understand the question. i hope you guys can help me with this, and i would greatly appreciate it

    in this question, is the unit vector due east and is a unit vector due north.

    At 0900 hours a ship sails from the point with the position vector (2i+3j)km relative to an origin O. The ship sails north-east with a speed of

    i) find in terms of i and j, the velocity of the ship.
    ii) show that the ship will be at the point with position vector (24.5i+25.5j)km at 1030hours.
    iii)find in terms of i,j and t, the position of the ship t hours after leaving P.

    thank you


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  3. #2 Re: Relative velocity -vectors 
    . DrRocket's Avatar
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    Quote Originally Posted by Heinsbergrelatz
    i tried to solve this but understand the question. i hope you guys can help me with this, and i would greatly appreciate it

    in this question, is the unit vector due east and is a unit vector due north.

    At 0900 hours a ship sails from the point with the position vector (2i+3j)km relative to an origin O. The ship sails north-east with a speed of

    i) find in terms of i and j, the velocity of the ship.
    ii) show that the ship will be at the point with position vector (24.5i+25.5j)km at 1030hours.
    iii)find in terms of i,j and t, the position of the ship t hours after leaving P.

    thank you
    If you don't understand the question, the you need to do a bit more study as to the nature of vectors.

    In trying to solve the problem I suggest that you first determine the vector of unit length in the direction of the given vector. With that in hand it should take you no more than a line to answer the remaining questions.


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  4. #3  
    Forum Ph.D. Heinsbergrelatz's Avatar
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    yea i studied about the unit vectors and i was able to solve it today, you are right it didnt even take a line of working,
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