An amusement-park car of mass (including passengers) is released from rest on a…

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

An amusement-park car of mass 300 kg300\,\text{kg} (including passengers) is released from rest on a frictionless track at a point 20 m20\,\text{m} above the bottom of a vertical circular section of radius 10 m10\,\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 m s−2g = 9.8\,\text{m}\,\text{s}^{-2}.) (a) 8.8×103 N8.8\times10^{3}\,\text{N} (b) 1.5×104 N1.5\times10^{4}\,\text{N} (c) 5.9×103 N5.9\times10^{3}\,\text{N} (d) 1.2×104 N1.2\times10^{4}\,\text{N}

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