Physics

Problem

An amusement-park car of mass

300\,\text{kg}

(including passengers) is released from rest on a frictionless track at a point

20\,\text{m}

above the bottom of a vertical circular section of radius

10\,\text{m}

. After descending the hill, the car enters the bottom of the circle. What is the magnitude of the normal force exerted by the track on the car at that lowest point? (Use

g = 9.8\,\text{m}\,\text{s}^{-2}

.) a)

8.8\times10^{3}\,\text{N}

1.5\times10^{4}\,\text{N}

5.9\times10^{3}\,\text{N}

1.2\times10^{4}\,\text{N}

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