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 moast 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 that the magnitude of the head velocity change was 10 m/s. which time interval for the collision would be closest to producing a possible concussion with an acceleration of 1000 m/s 2 ? a. 1s b. 0.1 s c. 10 -2 s d. 10 -3 s e. 10 -4 s
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 moast 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 that the magnitude of the head velocity change was 10 m/s. which time interval for the collision would be closest to producing a possible concussion with an acceleration of 1000 m/s 2 ? a. 1s b. 0.1 s c. 10 -2 s d. 10 -3 s e. 10 -4 s
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 moast 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 that the magnitude of the head velocity change was 10 m/s. which time interval for the collision would be closest to producing a possible concussion with an acceleration of 1000 m/s2?
A large wheel with a radius of 7 m completes a revolution every 16 seconds. The bottom of the wheel is 1.5 m above the ground.
a) Draw a graph showing the change in height of a person above the ground as a function of time for three revolutions, starting from the lowest point on the wheel.
b) Formulate the equation corresponding to the graph.
c) Predict the change in the graph and the equation if the Ferris wheel spins more slowly.
d) Verify the prediction you made in c) by plotting the graph for three revolutions and
revolutions and formulating the corresponding equation, if the wheel completes one revolution every 20 s. The average height of water in a harbour is 5 m. At low tide, the height of the water .
A ball is thrown from the top of a building and falls to the ground below. Its path is determine by the equation h=-4t square + 36t + 40, where h is the height above the ground in meters and t is the elapsed time in seconds. Determine:
a. The maximum height the ball reaches and the time it takes to reach maximum height by using the method of completing the square. Keep in fraction form. b. Determine when the ball hits the ground. c. What is the height of the building.
Galileo conducted an experiment where he rolled different balls down an inclined plane. Galileo determined that each ball traveled a distance that was directly proportional to the square of the time it traveled. What did Galileo conclude from this experiment?
A. Air resistance affects all objects equally.B. All objects accelerate toward Earth at the same rate.C. Objects with greater mass accelerate toward Earth faster than less massive objects.D. The force of friction from the inclined plane causes a decrease in the acceleration of an object.
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