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March 29, 2017

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In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.80 m/s relative to the ground. A teammate passes the ball to him. The ball has a speed of 13.6 m/s and is moving in a direction of 32.5 degrees east of north, relative to the ground.

a)What is the magnitude of the ball's velocity relative to Juan?

b)What is the direction of the ball's velocity relative to Juan?

How do you start this off? I found the y component and subtracted it to find the answer for the first part, but it says that my answer is wrong.

  • physics - ,

    a) ball relativeground=Juansspeed+ball relative to Juan

    13.6Cos32.5N + 13.6Sin32.5E =7.8N+ballrelative to Juan


    ball relative to Juan= (13.6Cos32.5-7.8)N+13.6Sin32.5E

    so figure out the N component, then magnitude= sqrt (Ncomp^2+Ecomp^2)

  • physics - ,

    i got the right answer for part a (8.18)
    now how do i do part b?

  • physics - ,

    you have the vector:

    Ncomp, E component

    relative to Juan, going N, so it is E of him by theta, where tantheta=Ecomp/Ncomp

  • physics - ,

    i cant get part b!!!!!!! im completely lost >.<

  • physics - ,

    Hi Chris

  • physics - ,

    On that Kobe System.
    Or Linsanity

  • physics - ,

    Make sure you're putting the parenthesis in the correct place. Such as for part A, the formulas should be:

    a) (ball relative ground) = (Juan's speed)+ (ball relative to Juan)

    (13.6Cos(32.5))N + (13.6Sin(32.5))E =(7.8)N+(ball relative to Juan)


    ball relative to Juan= (13.6(Cos(32.5))-7.8)N+(13.6Sin(32.5))E

    so figure out the N component, then magnitude= sqrt (Ncomp^2+Ecomp^2)

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