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Vocaloid

  • one year ago

simple momentum and force problem

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  1. Vocaloid
    • one year ago
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    an object moves in the x direction with a momentum of 8 kg * m/s. a force with Fx = -9N and Fy = 3N acts on the object for 0.15 seconds. what is the magnitude of the velocity after the 0.15 seconds have passed? my thought is to use the momentum update principle (final momentum = initial momentum + Fnet*deltaT) but I'm not sure how to set things up

  2. Abhisar
    • one year ago
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    So mass of the object is not given?

  3. Vocaloid
    • one year ago
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    no

  4. IrishBoy123
    • one year ago
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    you need the mass to get velocity

  5. Vocaloid
    • one year ago
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    @IrishBoy123 made a typo, it wants the magnitude of the momentum after 0.15 seconds. would I still need the mass for that?

  6. IrishBoy123
    • one year ago
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    nope, you're now good to go! i would do something like \[\vec p_o = <8,0>\] \[\vec F = \frac{d \vec p}{dt} \implies \Delta \vec p = \vec F .\Delta t\] \[\therefore \vec p = <8,0> + 0.15<-9,3>\] \[|\vec p| = \sqrt{p_x^2 + p_y^2}\]

  7. Vocaloid
    • one year ago
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    that's what I was thinking, too, I just had my numbers set up wrong I got the answer, thanks for your help ^_^

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