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As a city planner, you receive complaints from local residents about the safety of nearby roads...

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Physics

As a city planner, you receive complaints from local residentsabout the safety of nearby roads and streets. One complaintconcerns a stop sign at the corner of Pine Street and 1st Street.Residents complain that the speed limit in the area (55 mph) is toohigh to allow vehicles to stop in time. Under normal conditionsthis is not a problem, but when fog rolls in visibility can reduceto only 155 feet. Since fog is a common occurrence in this region,you decide to investigate. The state highway department states thatthe effective coefficient of friction between a rolling wheel andasphalt ranges between 0.536 and 0.599, whereas the effectivecoefficient of friction between a skidding (locked) wheel andasphalt ranges between 0.350 and 0.480. Vehicles of all typestravel on the road, from small VW bugs weighing 1150 lb to largetrucks weighing 7440 lb. Considering that some drivers will brakeproperly when slowing down and others will skid to stop, calculatethe miminim and maximum braking distance needed to ensure that allvehicles traveling at the posted speed limit can stop beforereaching the intersection.

Answer & Explanation Solved by verified expert
3.7 Ratings (433 Votes)
The speed limit in an area 55 mph is too high to allowvehicles to stop in timev 55 mphconverting mph into fts v 245    See Answer
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