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Math Help - questions in physics

  1. #1
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    questions in physics

    1 ) what will happend to the value of resultant when

    a ) vector A add to B and they are in the same directions and same magnitude ?
    b ) vector A add to B and they are in the opposite directions and equal magnitude ?
    c) vector A add to B and they are in the same directions and unequal magnitude ?
    d) vector A add to B and they are in the opposite directions and unequal magnitude ?

    a = resultant will be sum of two vectos
    b= resultant = 0
    c=resultant will be sum of two vectos
    d=resultant will be sum of two vectos

    2 ) a car traveling towards north is suddenly braked . What is the directiom of its accleration ?

    .... towards north

    3 ) A basball dropped from the roof of ball building. it take 3 seconds to hit the ground . The height of the building is

    vo = 0
    a = -9.81
    t=3

    now v = v0 + at
    = 0+(-9.81)(3) = -29.43

    now the height is Dx = v^2-V0 /2(a)
    = 44.145
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  2. #2
    MHF Contributor Unknown008's Avatar
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    1. We spell 'vectors' and not 'vectos' Good though. I would point out that for d, the directions are not to be neglected, that is one of the forces will bear a negative sign.

    2. If the car accelerates North... wouldn't it speed up towards the North?

    3. You can use a single formula for that...

    s = v_ot + \frac12 at^2

    s = 0(3) + \frac12 (-9.81)(3)^2 = 44.145 m

    Good. Only number 2 needs to be reviewed.
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