College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 77

In a head-on auto collision, the driver, who had his air bags disconnected, hits his head on the windshield, fracturing his skull. Assuming the driver's head has a mass of 4.0 kg, the area of the head to hit the windshield to be 25 cm 2 , and an impact time of 3.0 ms, with what speed does his head hit the windshield (Take the compressive fracture strength of the cranial bone to be 1.0 × 10 8 Pa.)