ScholarMatic: Explanation & Answer
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You are a professional witness in a lawsuit. What do youtell
the judge? What do you tell the Physicist (Read the followingscenario.)
You are on an RTD Stretch Bus (the long busses with the accordionin
the middle. (This is called an articulating bus.)) The bus isfully
loaded with fuel and people. You are traveling at 30 [mph] whena
mini-Van in front of the bus pulls in front of the bus as ittravels in
a similar direction; the van is traveling 20 [mph]. The bus driverslams
on the brakes, but there is black ice so the bus gracefullyslides
right into the van sending the van flying ahead. Threepassengers,
upon realizing their opportunity to make some quick cash, startcrying
of back and neck pain.
Mass of bus + passengers + fuel is about 66,600 [lb] or 30,200[kg].
Mass of van is about 2,000 [kg].
Forensics estimates from the bending of the light-pole that the vanwas
moving at an uninhibited speed of about 35 [mph] when it hit thepole
after sliding on ice.
You are a professional witness; what is your statement to thejudge
and why? (Three other passengers tell the judge they didn’t evenfeel
the collision. They heard it and saw the van fly forward; butthey
claim they felt nothing.)
You are a professional witness; what is your statement to thePhysicist
and why?
Your paper needs to address both the Judge (jury) and thePhysicist.
Treat each separately.
1) The Judge needs terms that are easy to understand.
You need to include some “real world” examples to drive home youranswer.
The Judge needs to see concepts of momentum exchange and a finalanswer for change in
speed for the bus in mph.
2) The Physicist needs to see calculations for momentumexchange
and a final answer for change in velocity for the bus in m/s.
Some students will want to address peak force (not required, butinteresting.)
In order to find peak force we need to know the time of thecollision.
Do some research to find some values for the time of collisionsand
calculate max and min force based upon your time range.
I called RTD and spoke with a trainer.
He told me the Articulator holds 163 passengers, 183 gallons offuel
and weighs in at 66,600[lb] when fully loaded.
ScholarMatic: Explanation & Answer
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