Lateral acceleration

[ramin86]

The cornering performance of an automobile is evaluated on a skid pad, where the maximum speed that a car can maintain around a circular path on a dry, flat surface is measured. Then the centripetal acceleration, also called the lateral acceleration, is calculated as a multiple of the free-fall acceleration g. The main factors affecting the performance are the tire characteristics and the suspension system of the car. A Dodge Viper GTS can negotiate a skidpad of radius 62.2 m at 86.5 km/h. Calculate its maximum lateral acceleration.

How do I find lateral acceleration??

[ramin86]

anyone know?

[ramin86]

I tried using the equation for centripetal acceleration but the answer was not correct.

[vsage]

I tried using the equation for centripetal acceleration but the answer was not correct.

Let's see your calculations first before entirely discarding centripetal acceleration

[ramin86]

nevermind, i got the answer by converting km/h to m/h. But theres one question that is really stumping me right now:

3. [PSE6 6.P.011.] A 3.85 kg object is attached to a vertical rod by two strings as in Figure P6.11. The object rotates in a horizontal circle at constant speed 7.30 m/s.

Figure P6.11

(a) Find the tension in the upper string.
N
(b) Find the tension in the lower string.
N

Not sure just what to do for this one, I tried a few equations given in examples by pluging in numbers, but didn't work.

[vsage]

nevermind, i got the answer by converting km/h to m/h. But theres one question that is really stumping me right now:

3. [PSE6 6.P.011.] A 3.85 kg object is attached to a vertical rod by two strings as in Figure P6.11. The object rotates in a horizontal circle at constant speed 7.30 m/s.

Figure P6.11

(a) Find the tension in the upper string.
N
(b) Find the tension in the lower string.
N

Not sure just what to do for this one, I tried a few equations given in examples by pluging in numbers, but didn't work.

I figured the units conversion was messing you up. Where are the strings attached to the rod? We can't give a definitive solution otherwise. Are they attached at the top and bottom so it swings in a path that's in the center of where the two strings are attached?

[ramin86]

http://www.webassign.net/pse/p6-11.gif

My fault, forgot the image. Nobody seems to be able to get this problem for whatever reason.