Uniform Circular Motion: A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding?
A. 9000 N
B. 9800 N
C. 300 N
D. 900 N
E. 3000 N
Answer: A
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