Automobile Accident Analysis . You are called as an expert witness to analyze the following auto accident: Car B , of mass 1900 kg, was stopped at a red light when it was hit from behind by car A , of mass 1500 kg. The cars locked bumpers during the collision and slid to a stop with brakes locked on all wheels. Measurements of the skid marks left by the tires showed them to be 7.15 m long. The coefficient of kinetic friction between the tires and the road was 0.65. (a) What was the speed of car A just before the collision? (b) If the speed limit was 35 mph, was car A speeding, and if so, by how many miles per hour was it exceeding the speed limit?
Automobile Accident Analysis . You are called as an expert witness to analyze the following auto accident: Car B , of mass 1900 kg, was stopped at a red light when it was hit from behind by car A , of mass 1500 kg. The cars locked bumpers during the collision and slid to a stop with brakes locked on all wheels. Measurements of the skid marks left by the tires showed them to be 7.15 m long. The coefficient of kinetic friction between the tires and the road was 0.65. (a) What was the speed of car A just before the collision? (b) If the speed limit was 35 mph, was car A speeding, and if so, by how many miles per hour was it exceeding the speed limit?
Automobile Accident Analysis. You are called as an expert witness to analyze the following auto accident: Car B, of mass 1900 kg, was stopped at a red light when it was hit from behind by car A, of mass 1500 kg. The cars locked bumpers during the collision and slid to a stop with brakes locked on all wheels. Measurements of the skid marks left by the tires showed them to be 7.15 m long. The coefficient of kinetic friction between the tires and the road was 0.65. (a) What was the speed of car A just before the collision? (b) If the speed limit was 35 mph, was car A speeding, and if so, by how many miles per hour was it exceeding the speed limit?
You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was
traveling eastward. Car B weighs 1125 lb and was traveling westward at 42.0 mph. The cars locked bumpers and slid eastward
with their wheels locked for 18.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and
the pavement to be 0.750.
What speed u (in miles per hour) was car A traveling just
before the collision? (This problem uses English units
because they would be used in a U.S. legal proceeding.)
V =
x10
TOOLS
mph
You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 43.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 17.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750.
What speed v (in miles per hour) was car A traveling just before the collision? (This problem uses English units because they would be used in a U.S. legal proceeding.)
You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was
traveling eastward. Car B weighs 1125 lb and was traveling westward at 43.0 mph. The cars locked bumpers and slid eastward
with their wheels locked for 22.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and
the pavement to be 0.750.
What speed u (in miles per hour) was car A traveling just
before the collision? (This problem uses English units
because they would be used in a U.S. legal proceeding.)
V =
mph
Chapter 8 Solutions
University Physics with Modern Physics (14th Edition)
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