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Homework Help: physics

Posted by sandhu on Wednesday, November 24, 2010 at 8:37pm.

Posted by sandhu on Wednesday, November 24, 2010 at 4:29am.


The firetruck goes around a 180, 162 m radius circular curve. It enters the curve with a speed of 12.6 m/s and leaves the curve with a speed of 38.8 m/s. Assuming the speed changes at a constant rate, what is the magnitude of the total acceleration of the firetruck just after it has entered the curve?



physics - MathMate, Wednesday, November 24, 2010 at 8:16am
From the length of the curve (L=r), calculate the average tangential acceleration, At
= (38.8-12.6)/L
Find the radial acceleration due to curvature at entry to curve (v=12.6m/s)
Ar=v/r
=12.6/r

Since the two accelerations are perpendicular to each other, add Ar and At vectorially.



physics - sandhu, Wednesday, November 24, 2010 at 7:50pm
I don't understand how you get At = (38.8 - 12.6)/L.Please explain
Thanks.

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