A car can be braked to a stop from the autobahn-likespeed of 200 km/h in 170 m. Assuming the acceleration is constant,find its magnitude in (a) SI units and (b) in terms of g. (c) How muchtime Tb is required for the braking? Your reaction time Tr is the timeyou require to perceive an emergency, move your foot to the brake,and begin the braking. If Tr = 400 ms, then (d) what is Tb in terms ofTr, and (e) is most of the full time required to stop spent in reactingor braking? Dark sunglasses delay the visual signals sent from theeyes to the visual cortex in the brain, increasing Tr. (f) In the extremecase in which Tr is increased by 100 ms, how much farther doesthe car travel during your reaction time?
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
A car can be braked to a stop from the autobahn-like
speed of 200 km/h in 170 m. Assuming the acceleration is constant,
find its magnitude in (a) SI units and (b) in terms of g. (c) How much
time Tb is required for the braking? Your reaction time Tr is the time
you require to perceive an emergency, move your foot to the brake,
and begin the braking. If Tr = 400 ms, then (d) what is Tb in terms of
Tr, and (e) is most of the full time required to stop spent in reacting
or braking? Dark sunglasses delay the visual signals sent from the
eyes to the visual cortex in the brain, increasing Tr. (f) In the extreme
case in which Tr is increased by 100 ms, how much farther does
the car travel during your reaction time?
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