a Newton, Einstei Take Test Prelat The Expert × | G A 75.0kg Per mywu Mail-laure

Question

a Newton, Einstei Take Test Prelat The Expert × | G A 75.0kg Per mywu Mail-laurenco Ch06c Begin Date: 2/12/2018 1.00 AM Due Date: 222/2018 11 0000 AM Ead Date: 531/2018 120000 AM (10%) Problem 9: A,2.5 kg person s ning in a car moing at 20.5 m s (assume this is the potse direction) when the c. rns nto a bridge abutment This probilem wall illustrate why the inv emtion of the airbag dramatically improved the safety of 50% Part (a) Calculate th botu taal compotent ofthe average kece, a newtons, on the pers e he is stopped by a padded dashboard that compresses an average of 0.95 cm atano . Degrees O Radi Submission History ancessed F- 16035855 1604000 s-1300000 50% Part (b) Calculate the honnontal component of the ave, age fece, in ontos. on the penon if he ii apped by . bag dat

Explanation / Answer

a)

F = ma, and vf^2 = vi^2 + 2ad,

so a = (vf^2 - vi^2) / (2d)

a = (0 - 20.5^2) / (2(0.0095))

a = -2.21 x 10^4

F = ma

F = (72.5)(-2.1 x 10^4)

F = -1.60 x 10^6 N

b)

F = ma, and vf^2 = vi^2 + 2ad,

so a = (vf^2 - vi^2) / (2d)

a = (0 - 20.5^2) / (2(0.13))

a = -0.1616 x 10^4

F = ma

F = (72.5)(-2.1 x 10^4)

F = -1.17 x 10^5 N

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