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)?
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 .
According to Timothy Treadwell in 2001 "Now, the bears I live with average, the
males are on average twelve hundred pounds. They're the largest bears in the
world and they've been clocked at 41 [mph] and they've run a hundred meter
dash in 5.85 seconds which human on stimulants doesn't even approach.
a. Compute the speed of a grizzly bear using Mr. Treadwell's hundred-meter
statement.
b. Compute the momentum of a grizzly bear using the speed you calculated in
part a. and the average mass stated by Mr. Treadwell.
c. How fast would a 250 lb man have to run to have the same momentum you
calculated in part b?
d. How fast would a 4000 lb car have to drive to have the same momentum you
calculated in part b?
1. Kenny is climbing the stairs of his apartment building for exercise. Kenny weighs 83 kg. There are 8 steps in each flight and the height of a single step on the staircase is 11 inches. He climbs the flight of stairs in 3.4 seconds.
a.) calculate the long-term rate at which stairs can be climbed considering the given information.(how long can be sustained in stair per second)
b.) Why does Kenny descend stairs at a faster rate for a nearly unlimited time although very similar forces are exerted descending as they are ascending?(This points to a fundamentally different process for descending versus climbing stairs.)
Chapter 2 Solutions
College Physics: Explore And Apply, Volume 2 (2nd Edition)
Essential University Physics: Volume 1 (3rd Edition)
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