|May5-08, 12:06 AM||#1|
[b]1. 2) A car is moving at 60.0 m/s and crashes into a wall. The messenger is not wearing his seat belt.
a. What is the average force acting on the passenger of 70 kg if he is brought to rest by a collision with the windshield and dashboard that lasts 3.5 ms.
b. Compare this value of the average force with the average force exerted by an air bag that bring the passenger to rest in 40 ms.
[b]2. delta(p)=Force*delta time
Fave= delta p/ delta t
3. The attempt at a solution
a) Momentum of the person
70 kg * 60 m/s = 4200 kg*m/s
F ave= 4200/.0035 sec= 1.2*10^ 6 N
B) 4200/.040 sec= 10.5*10^4 N
|May5-08, 12:58 AM||#2|
So what is your question? You need to start being more specific what you need help with.
Your math looks fine and I would think that's the right answer if your equation are correct.
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