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Introductory Physics Homework Help
Uniform Circular Motion question
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[QUOTE="devilish_wit, post: 6075611, member: 651841"] [h2]Homework Statement [/h2] While learning to drive, you are in a [B]1 320-kg car[/B] moving at [B]34.0 m/s[/B] across a large, vacant, level parking lot. Suddenly you realize you are heading straight toward a brick sidewall of a large supermarket and are in danger of running into it. The pavement can exert a [B]maximum horizontal force of 6 300 N[/B] on the car. (1) Suppose you apply the brakes and do not turn the steering wheel. Find the minimum distance you must be from the wall to avoid a collision. (2) If you do not brake but instead maintain constant speed and turn the steering wheel, what is the minimum distance you must be from the wall to avoid a collision? [h2]Homework Equations[/h2] F = ma a = V^2 / r [h2]The Attempt at a Solution[/h2] m = 1320 kg v = 34 m/s F = 6300 N (1) F = ma 6300 N = 1320kg a ---> a = 6300 N/1320kg = [B]4.77 m/s^2[/B] Vf^2 = Vi^2 x 2ad 0 = (34 m/s)^2 + (2)(4.77)d (34m/s)^2 / 2(4.77m/s^2) = d ---> [B]d = 121.17m (This answer is correct) [/B] (2) a = v^2 / r... I'm not sure how to answer this second question and where to start. Any ideas? [/QUOTE]
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