Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter7: Gravity
Section: Chapter Questions
Problem 1PQ: We use the terms sunset and sunrise. In what way are these terms misleading?
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The head injury criterion (HIC) is used to assess the likelihood of head injuries arising from various types of collisions; an HIC greater than about 1000 s is likely to result in severe injuries or even death. The criterion can be written as HIC = (aavg/g)2.5Δt, where aavg is the average acceleration during the time Δt that the head is being accelerated, and g is the free-fall acceleration. Shown is a simplified graph of the net force on a crash dummy’s 4.5 kg head as it hits the airbag during a automobile collision. What is the HIC in this collision?
Transcribed Image Text:F (N)
2000 -
1500 -
1000-
500-
0+
O 20 40
t (ms)
80 100 120
60
FIGURE P4.27
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