# Circular motion of a train

by tyro008
Tags: circular, motion, train
 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$$_{}2$$ m. At one instant, the train has an angular acceleration of 1.50 X 10^-3 rad/s$$_{}2$$ 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$$_{}NET$$ = $$\sqrt{}ac2^{}_{} + at2^{}$$ 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