physics

Curve A is banked at 11.2 °, and curve B is banked at an angle of 15.2 °. A car can travel around curve A without relying on friction at a speed of 14.5 m/s. At what speed can this car travel around curve B without relying on friction?
Do I need to find radius in order to solve for this one, I'm kinda lost please advice.

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asked by S
  1. I was able to solve this problem
    at firs, use the equation V=sqrt(R g tan theta)
    since you have two angles you will need to separate the equation into 2
    Va= sqrt(r g tan a theta)
    Vb= sqrt (r g tan b theta)
    then solve for Vb
    Vb/Va= sqrt(r g tanb )/ sqrt(r g tan a theta)

    r and g will cross out
    therefore, Vb= sqrt( tan b theta)/ sqrt(tan a theta)* Va
    So the answer should be:
    Vb= sqrt tan 15.2/ sqrt tan 11.2* 14.5
    vb= 16.99 m/s or 17 m/s

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    posted by S

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