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April 20, 2014

Homework Help: physics

Posted by JRD on Thursday, June 16, 2011 at 12:27am.

A train slows down at a constant rate as it
rounds a sharp circular horizontal turn. Its
initial speed is not known. It takes 19.8 s to
slow down from 81 km/h to 37 km/h. The
radius of the curve is 164 m.
As the train goes around the turn, what is
the magnitude of the tangential component of
the acceleration?
Answer in units of m/s2.

At the moment the trainís speed is 55 km/h,
what is the magnitude of the total accelera-
tion?
Answer in units of m/s2.

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