(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A car moving at a speed of 34 m/s enters a curve that describes a quarter turn of radius 117 m. The driver gently applies the brakes, giving a constant tangential deceleration of magnitude 1.2 m/s2. Just before emerging from the turn, what is the magnitude of the car's acceleration?

2. Relevant equations

w=radians/sec

f=frequency=rev/sec

T=period

w=2(pi)/T=2(pi)(f)

a=(w^2)(r)

3. The attempt at a solution

f = (34m/s)/(2(pi)(117)= 0.0463 revolutions/sec ... the quarter turn should not be relevant at this point because this is just speed.

w=2(pi)f= 0.291 radians/second .... still just speed... right?

a = w^2 * r = (0.291)^2 * 117 =9.91 m/s^2... now i tried talked a fourth of this, and then subtracting the 1.2m/s/s deceleration... that didn't work. neither did taking the 1.2 off of it without taking a fourth.

I can't figure out what im missing or doing wrong :(

Thanks for any help in advance!

-Alex

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# Homework Help: Car In Curve

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