Asked by Rick
A man claims he can safely hold on to a 9.7-kg child in a head-on collision with a relative speed of 112-mi/h lasting for 0.12 s as long as he has his seat belt on.
(a) Find the magnitude of the average force needed to hold onto the child. HELP
(a) Find the magnitude of the average force needed to hold onto the child. HELP
Answers
Answered by
DanH
The child is going from a speed of 112 mi/h to a speed of 0 in .12 seconds...so their is a deceleration...Does this help?
Answered by
drwls
112 m/h = 180 km/h = 50 m/s
The deceleration rate is
a = (50 m/s)/0.12s = 416 m/s^2
That's about 42 g's.
The force to hold the child required is F = m a, which is about 42 times the child's weight.
Do the calculation and answer in Newtons or pounds..
The deceleration rate is
a = (50 m/s)/0.12s = 416 m/s^2
That's about 42 g's.
The force to hold the child required is F = m a, which is about 42 times the child's weight.
Do the calculation and answer in Newtons or pounds..
Answered by
Dixie
N=m*v/t
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