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## Homework Statement

Consider a train that rounds a curve with a radius of 570 m at a speeed of 160 km/h (a) Calculate the friction force needed on a train passenger of mass 75 kg if the track is not banked and the train does not tilt. (b) Calculate the friction force on the passenger if the train tilts at an angle of 8.0 degrees toward the center of the curve.## Homework Equations

Ac= mV^2/r, F=ma## The Attempt at a Solution

Ok so for part (a) I can use the equation for Centripital Acc, Ac=mv^2/r, to find the acceleration of the system. Then using F=mAc I can find the force that the train is putting on the passenger. Now the equation for friction is F=uN. Unfortunatly I do not know the coffeciant of friction. Is this problem solveable with the data given? Am I missing an assumption that I may make?
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