The average length of the reproductive cycle for females is 2â4 weeks. Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. The first stage of the reproductive cycle is proestrus, in which eggs in the ovaries begin to mature and estrogen levels begin to rise.
It usually takes a head-on impact into something fairly solid at 30mph or more to trigger a frontal airbag. A car could be involved in a roll-over crash at 100mph or more, where it could flip over several times, and if there was no significant single front impact detected, the airbags wouldn't trigger.
The bag's internal pressure, when fully inflated is about 10 to 30  kPa, which is comparatively low but sufficient to safeguard the  driver if dashed against it. The driversâ¦ thrust on the air-bag  pushes gas to escape through two large outlet holes in the rear of  the bag to further cushion the impact.