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Posted by on Monday, January 18, 2010 at 1:39pm.

A curve in a road forms part of a horizontal circle. As a car goes around it at constant speed 14.0 m/s, the total force exerted on the driver has magnitude 115 N. What are the magnitude and direction of the total vector force exerted on the driver if the speed is 25.0 m/s instead?
I thought you would use proportions, but its not right. THANK YOU

  • PHYSICS - , Monday, January 18, 2010 at 1:51pm

    Ignoring gravity

    v^2/R = centripetal acceleration

    So force toward center = mv^2/R
    115 N = m 14^2/R
    so
    m/R = 115/14^2

    F = m 25^2/R = (115/14^2) (25^2)

  • PHYSICS - , Monday, January 18, 2010 at 1:53pm

    Thank you so much! Makes perfect sense =D

  • PHYSICS - , Monday, January 18, 2010 at 1:55pm

    You are welcome :)

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