A Car Is Traveling on a Curve That Forms a Circular

question 76

Multiple Choice

A car is traveling on a curve that forms a circular arc. The force F needed to keep the car from skidding is jointly proportional to the weight $\text {W }$
Of the car and the square of its speed s, and is inversely proportional to the radius r of the curve. A car weighing 2,500 lbs travels around a curve at 70 mi/h. The next car to round this curve weighs 4,900 lbs and requires the same force as the first car to keep from skidding. How fast is the second car traveling?

• A) \(49 \mathrm { mi } / \mathrm { h }\)
• B) \(50 \mathrm { mi } / \mathrm { h }\)
• C) \(44 \mathrm { mi } / \mathrm { h }\)
• D) \(54 \mathrm {~min}\)
• E) \(52 \mathrm { mi } / \mathrm { h }\)

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