Problem 9.20 One study suggests that a brain concussion can occur if a person\'s

Question

Problem 9.20 One study suggests that a brain concussion can occur if a person's head is subjected to an acceleration as small as 609,where g is the acceleration of gravity Part A If the mass of the person's head is 4.4 kg, what is the magnitude of the force? Express your answer to two significant figures and include appropriate units Value Units Submit My Answers Give Ujp Part B If the impulse delivered to the person's head is 17 kg m/s, over what time interval is the force applied? Express your answer to two significant figures and include appropriate units. Value Units Submit My Answers Give Up

Explanation / Answer

A)

Given:

a = 60g = 60*9.8 m/s2

m = 4.4 kg

We know, F = ma

= (4.4)(60*9.81) = 2600 N

B)

Given: I = 17 kg m/s

We know: I = Fdt

so,

dt = I/F = 17/2600 = 6.6*10^-3 s

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