Physics

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At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the magnitude and direction of its average acceleration

find (a) the x and y components of the plane’s average acceleration and (b) the magnitude and direction of its average acceleration
d) for this time interval, find the direction of its average acceleration?
=? counterclockwise from + x axis

im having a hard time solving this problem

and for question (a) fo x i got 104.8 i got that wrong plus i even rounded it to 150 still wroung

  • Physics -

    vx1 = 695 km/h = 193.06 m/s
    vy1 = 440 km/h = 122.22 m/s
    vx2 = 933 km/h = 259.17 m/s
    vy2 = 465 km/h = 129.17 m/s

    avarage ax = (vx2 - vx1)/7.12 s
    = 9.29 m/s^2

    average ay = (vy2 - vy1)/7.12s
    = 0.98 m/s^2

    I hope you can see where you made your error and proceed from there.

  • Physics -

    but it has to equal km/h^2 and i got those anwsers wrong

  • Physics -

    I am surprised they are asking for acceleration in unconventional units of km/h^2. You should recheck that.

    If you want km/h^2 units, the time interval is
    7.12 s = 1.978*10^-3 h

    ax = (933-695)/1.9878*10^-3
    = 3.02*10^4 km/h^2
    so I still don't see how you got your answer of 104.8 in whatever units you are using

  • Physics -

    (933-695)/7.12- 4.85 = 238/2.27= 104.84 that's how i got that anwser...

  • Physics -

    You are quite right, I forgot to do the time subtraction for the interval. I also made a computational error in the division.

    7.12 - 4.85 = 2.27 s = 6.306*10^-4 h

    ax = 29.1 m/s^2
    = 3.77*10^5 km/h^2

    Here is what you did wrong:
    To get acceleration in units of km/h^2, you divided the speed change in km/h by the time interval in SECONDS.

    What you did gave you the average acceleration in (km per hour) per second

  • Physics -

    how did you get 29.1 to = 3.77* 10^5?

  • Physics -

    nevermind you converted it

  • Physics -

    b i got 3.96x10^4 km.h and i already did the magnitude which it 3.80x10^5

    for the last question about the "for this time interval, find the direction of its average acceleration.
    = ? countercloclock wise from + x axis

  • Physics -

    The direction of the avg. acceleration, clockwise from +x axis, is arctan ay/ax

    You have the wrong dimensions following your ax. km.h is not a dimension of acceleration.

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