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Normal Force and Weight

  1. Nov 21, 2006 #1
    A car travels at a constant speed of 23 m/s through a small valley whose cross section is like a circule of radius 310 m. What is the magnitude of the normal force on the car, expressed as a multiple of the car's weight?

    what does it mean by the cross section and how does it relate to the problem?
  2. jcsd
  3. Nov 21, 2006 #2
    You can assume the valey is sort of a semi-cylinder and the car travels on the circular part of it.
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