Cars B and C are waiting at a stop sign when box truck A (whose driver had fallen asleep) rear- ends car B. At the time of impact: • box truck A (weighing 8500 lbs) was traveling at VA = 50 mph • the driver of car B (weighing 2500 lbs) had just taken his foot off the brake in anticipation of moving up in line • the woman driving car A (weighing 2500 lbs) still had her foot firmly on the brake because she could see the old man and his dog crossing the street across the intersection (d₂ = 24 ft) Assume all impacts are perfectly plastic (the cars remain stuck together after each impact). Determine: (a) What is the velocity of system AB after the first impact? (b) What is the velocity of system ABC immediately after the second impact? (c) The dog is young and nimble and can react quickly, but the man is old and slow and can't possibly react in time. What is the required coefficient of friction between tire and road for the man to not get hit? (d) On this particular day, the weather was overcast and drizzly, and the road was wet. Does the man get hit? Justify your answer.

Cars B and C are waiting at a stop sign when box truck A (whose driver had fallen asleep) rear- ends car B. At the time of impact: • box truck A (weighing 8500 lbs) was traveling at VA = 50 mph • the driver of car B (weighing 2500 lbs) had just taken his foot off the brake in anticipation of moving up in line • the woman driving car A (weighing 2500 lbs) still had her foot firmly on the brake because she could see the old man and his dog crossing the street across the intersection (d₂ = 24 ft) Assume all impacts are perfectly plastic (the cars remain stuck together after each impact). Determine: (a) What is the velocity of system AB after the first impact? (b) What is the velocity of system ABC immediately after the second impact? (c) The dog is young and nimble and can react quickly, but the man is old and slow and can't possibly react in time. What is the required coefficient of friction between tire and road for the man to not get hit? (d) On this particular day, the weather was overcast and drizzly, and the road was wet. Does the man get hit? Justify your answer.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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