BIO Head injuries in sports 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/s 2 . However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s 2 , with most of the 11 over 1000 m/s 2 . Suppose the average speed while stopping was 4 m/s (not necessarily the correct value) and the collision lasted 0.01 s. Which answer is closest to the head’s stopping distance (the distance it moves while stopping)? a. 0.04 m b. 0.4 m c. 4 m d. 0.02 m e. 0.004 m
BIO Head injuries in sports 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/s 2 . However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s 2 , with most of the 11 over 1000 m/s 2 . Suppose the average speed while stopping was 4 m/s (not necessarily the correct value) and the collision lasted 0.01 s. Which answer is closest to the head’s stopping distance (the distance it moves while stopping)? a. 0.04 m b. 0.4 m c. 4 m d. 0.02 m e. 0.004 m
BIO Head injuries in sports 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/s2. However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s2, with most of the 11 over 1000 m/s2.
Suppose the average speed while stopping was 4 m/s (not necessarily the correct value) and the collision lasted 0.01 s. Which answer is closest to the head’s stopping distance (the distance it moves while stopping)?
Amtrak's 20th-Century Limited is en route from Chicago to New York at 120 km/h when the engineer spots a cow on the track. The train brakes to a halt in 1.5 min , stopping just in front of the cow. What is the magnitude of the train's acceleration?
You are sitting in your car at a red light when you see a zombie standing still 65m in front of your car. You both begin to accelerate towards each other. Your car accelerates at 1.8 m/s^2 and the zombie accelerates at 0.6 m/s^2. How long does it take for you to strike the zombie?
Make sure to include a diagram of the physical situation, label know and unknown quantities with units, coordinate system.
Please use grade 12 kinematics and label the variables as v1, v2, a (Acceleration), t (time), d (displacement)
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Crash acceleration. A car crashes head on into a wall and stops, with the front collapsing by 0.500 m. The driver is firmly held to the seat by a seat belt and thus moves forward by 0.500 m during the crash. Assume that the acceleration is constant during the crash. What is the magnitude of the driver’s acceleration in g units if the initial speed of the car is (a) 35 mi/h and (b) 70 mi/h?
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