Homework Practice
Now, let's walk through a kinematics problem together.
Problem
According to William M. Briggs, "Statistician to the Stars," a human blink takes between 300 and 400 milliseconds. So, let's say that a blink takes 350 milliseconds. Let's also assume that Dr. Briggs considers a blink to be the time it takes for you to close your eyes and then open them back up. In that case, according to Dr. Briggs, half of a blink (just closing your eyes without re-opening them) takes 1/2 of 350 milliseconds, or 175 milliseconds.
Let's say that blinking involves motion of only the upper eye lid, and let's say that the opening of the typical adult human eye has a vertical height of about 12 millimeters.
Assuming the acceleration of the upper eyelid is constant, use the information above to find the acceleration of the blinking upper eyelid when it closes.
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Let's say that blinking involves motion of only the upper eye lid, and let's say that the opening of the typical adult human eye has a vertical height of about 12 millimeters.
Assuming the acceleration of the upper eyelid is constant, use the information above to find the acceleration of the blinking upper eyelid when it closes.
Go to the next page to get started.