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Circular motion of a train 
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#1
Nov208, 03:01 PM

P: 20

1. The problem statement, all variables and given/known data
A train is rounding a circular curve whose radius is 2.00 X 10[tex]_{}2[/tex] m. At one instant, the train has an angular acceleration of 1.50 X 10^3 rad/s[tex]_{}2[/tex] and an angular speed of 0.0400 rad/s. (a) Find the magnitude of the total acceleration (centripetal plus tangential) of the train. (b) Determine the angle of the total acceleration relative to the radial direction. 2. Relevant equations a[tex]_{}NET[/tex] = [tex]\sqrt{}ac2^{}_{} + at2^{}[/tex] and Ac is the centripetal acceleration, At is the tangential acceleration 3. The attempt at a solution i tried using this equation, but i couldn't find At. to find this, you need delta velocity divided by delta time, but there is no time and i don't know if angular speed is the same thing as regular velocity 


#2
Nov208, 06:22 PM

P: 1

You can find At by using the formula: angular acceleration = tangential acceleration / radius.
I'm not sure how to find the angle though... 


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