Question
Asked Dec 24, 2019
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The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.4 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 km/h in 5.0 ms. If the arm has an effective mass of 3.0 kg and bone material can withstand a maximum compressional stress of 16 x 107 Pa, is the arm likely to withstand the crash?

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Expert Answer

Step 1

Initial velocity,

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v = 80 km/h

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Step 2

Mass of the arm,

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m = 3.0 kg

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Step 3

The acceleration o...

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dv dt 1000 m 1 km 1 min 1h 80 km/h 60 s 60 min (10 s 5 ms| 1 ms 22.2 m/s 0.005 s = 4440 m/s?

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Physics