Rather wordy problem.
Vf^2=Vi^2+2ad
solve for a, then F=ma
Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton's first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm.
A 60 kg person is in a head-on collision. The car's speed at impact is 15 m/s . Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
4 answers
Using the equation provided we can just substitute our knowns and solve for a.
(15m/s)^2=(0m/s)^2+2a(1m)
a=112.5 m/s^2
F=ma
F=(60kg)(112.5m/s^2)
6750 N
(15m/s)^2=(0m/s)^2+2a(1m)
a=112.5 m/s^2
F=ma
F=(60kg)(112.5m/s^2)
6750 N
Answers for Technology Trade-offs Quick Check
Seat belts are designed to be effective in(1 point)
The answer is: *speed collisions by applying a backward force on the body.*
Which statement best describes a risk from automobile air bags?(1 point)
The right ans is : *Air bags can cause injury when they are too close to passengers, so manufacturers are still making improvements to the design.*
What must consumers be willing to give up when they purchase an electric vehicle?(1 point)
the right answer is: *convenient fueling*
Which trade-off must a consumer consider when deciding between an electric vehicle and a gasoline-powered vehicle?(1 point)
The right answer is: *trading lower carbon dioxide emissions for lower up-front costs*
Which design constraint was most directly responsible for the Tacoma Bridge disaster?(1 point)
The right answer is: *Cost*
ill get you 5/5:D
100% right
Seat belts are designed to be effective in(1 point)
The answer is: *speed collisions by applying a backward force on the body.*
Which statement best describes a risk from automobile air bags?(1 point)
The right ans is : *Air bags can cause injury when they are too close to passengers, so manufacturers are still making improvements to the design.*
What must consumers be willing to give up when they purchase an electric vehicle?(1 point)
the right answer is: *convenient fueling*
Which trade-off must a consumer consider when deciding between an electric vehicle and a gasoline-powered vehicle?(1 point)
The right answer is: *trading lower carbon dioxide emissions for lower up-front costs*
Which design constraint was most directly responsible for the Tacoma Bridge disaster?(1 point)
The right answer is: *Cost*
ill get you 5/5:D
100% right
Thank you for the feedback and confirmation! I'm glad I could help.
1 answer