At the scene of a car accident, the forensic investigator measured the skid marks from one of the vehicles to be 83 m long. He also knows the typical acceleration for a car when you slam on the brakes is -4 m/s 2. The speed limit for this area is 100 km/hr (about 28 m/s). Was the car speeding before it hit the brakes?

At the scene of a car accident, the forensic investigator measured the skid marks from one of the vehicles to be 83 m long. He also knows the typical acceleration for a car when you slam on the brakes is -4 m/s 2. The speed limit for this area is 100 km/hr (about 28 m/s). Was the car speeding before it hit the brakes?

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter1: Measurement

Section: Chapter Questions

Problem 26SA

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At the scene of a car accident, the forensic investigator measured the skid marks from one of the vehicles to be 83 m long. He also knows the typical acceleration for a car when you slam on the brakes is -4 m/s2. The speed limit for this area is 100 km/hr (about 28 m/s). Was the car speeding before it hit the brakes?
Some vehicles along super highways in the Philippines run at almost break-neck speed of 80 km/h. What is the speed in miles per hour (mi/h)? Conversion factor: 1.609 km = 1 mile
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Problem 2: A car is traveling at a speed of 33 m/s. Part (a) What is its speed in kilometers per hour? Numeric : A numeric value is expected and not an expression. Skm/h = %D Part (b) Suppose the speed limit is 79 km/h. How many kilometers per hour would the car need to slow down to be going the speed limit? Numeric : A numeric value is expected and not an expression. As =
A car is traveling at 30 m/s ( approximately 67 mph) on I-95 highway. The driver applies the brakes and the car comes to a stop in 4.0 s . What is the car's acceleration, in m/s2? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed.
A student drove to the university from her home and noted that the odometer reading of her car increased by 19.5 kilometers. The trip took 20.3 min. What was her average speed, in METERS per second? If she drove back home using the same path she took out to the university and arrives 7.2 h after she first left home, what was her average speed for the entire trip, in meters per second?
Bay City and Vernonville are 128 miles apart. A car leaves Bay City traveling towards Vernonville, and another car leaves Vernonville at the same time, traveling towards Bay City. The car leaving Bay City averages 10 miles per hour more than the other, and they meet after 1 hour and 36 minutes. What are the average speeds of the cars? The car leaving Bay City averages what mph? The car leaving Vernonville averages what mph?
A driving instructor reports that crashing a car at 30 mi/hmi/h is equivalent to dropping the car from a height of just over 40 feet. Calculate the drop height corresponding to the crash. Express your answer using two significant figures.
A research group at Dartmouth College has developed a Head Impact Telemetry (HIT) System that can be used to collect data about head accelerations during impacts on the playing field. The researchers observed 249,613 impacts from 423 football players at nine colleges and high schools and collected collision data from participants in other sports. The accelerations during most head impacts (>89%) in helmeted sports caused head accelerations less than a magnitude of 400 m/s2m/s2. However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s2m/s2, with most of the 11 over 1000 m/s2m/s2 Suppose that the magnitude of the head velocity change was 13 m/sm/s. Find time interval for the collision which would produce a possible concussion with an acceleration of 1000 m/s2m/s2?
A research group at Dartmouth College has developed a Head Impact Telemetry (HIT) System that can be used to collect data about head accelerations during impacts on the playing field. The researchers observed 249,613 impacts from 423 football players at nine colleges and high schools and collected collision data from participants in other sports. The accelerations during most head impacts (>89%) in helmeted sports caused head accelerations less than a magnitude of 400 m/s2m/s2. However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s2m/s2, with most of the 11 over 1000 m/s2m/s2. Find the average speed of the head while stopping. Suppose that the magnitude of the head velocity change was 14 m/sm/s. Express your answer with the appropriate units
A research group at Dartmouth College has developed a Head Impact Telemetry (HIT) System that can be used to collect data about head accelerations during impacts on the playing field. The researchers observed 249,613 impacts from 423 football players at nine colleges and high schools and collected collision data from participants in other sports. The accelerations during most head impacts (>89%) in helmeted sports caused head accelerations less than a magnitude of 400 m/s2m/s2. However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s2m/s2, with most of the 11 over 1000 m/s2m/s2. Suppose that the magnitude of the head velocity change was 8.0 m/s and acceleration was 1000 m/s2. Use equation 2ax(x−x0)=v2x−v20x to determine the head's stopping distance.
Abdul, while driving to school. computes the average for his trip to be 20km/h. On his return trip along the same route, there is less traffic and the average speed is 40km/h. What is the average speed for Abdul's trip?