# Homework Help: Magnitude of centripedal acceleration

1. Nov 11, 2008

### dr2112

1. The problem statement, all variables and given/known data

car speed from 40m/s to 84m/s
traveling counterclockwise around a track 6.6x10^2m
when it reaches 68m/s find:
magnitude of centripedal acceleration
angular speed
tangential acceleration
magnitude of total acceleration

2. Relevant equations
ac=v^2/r
w=v/r
at= (v-vo)/delta t
a=square root of (ac^2+at^2)

3. The attempt at a solution

I have no idea where to start its been a while since I did physics problems.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 11, 2008

### PhanthomJay

Re: acceleration

Your equations are good, but some info is missing in the problem statement. Is the time given? Is 660m the radius of the track?

3. Nov 11, 2008

### dr2112

Re: acceleration

Yes, 660m is the radius of the track.

No time is given all it states is that accelerates from 40 m/s to 84 m/s and to find all that info once the car reaches 68m/s

Thanks

4. Nov 11, 2008

### borgwal

Re: acceleration

Witht the info you have given you can only determine the angular speed and the centripetal acceleration.

5. Nov 13, 2008

### dr2112

Re: acceleration

So here is what I came up with for magnitude and angular speed:

7.006m/s2

6. Nov 13, 2008

### borgwal

Re: acceleration

Numerically fine, but too many digits.

7. Nov 14, 2008

### dr2112

Re: acceleration

Thanks.

Now if I could only figure out how you would get the tangential and total acceleration. There is no other information provided in the problem.

8. Nov 14, 2008

### borgwal

Re: acceleration