Question

Two cars are traveling on level terrain at 60 mi/h on a road
with a coefficient of adhesion of 0.8. The driver

of car 1 has a 2.5-s perception/reaction time and the driver of car
2 has a 2.1-s perception/reaction time.

Both cars are traveling side by side and the drivers are able to
stop their respective cars in the same distance

after first seeing a roadway obstacle (perception and reaction plus
vehicle stopping distance). If the braking

efficiency of car 2 is 0.78, determine the braking efficiency of
car 1. (Assume minimum theoretical stopping

distance and ignore aerodynamic resistance.)

Answer #1

A car is traveling up a 1.5% grade at 65 mi/hr on good, wet
pavement. The driver brakes to try to avoid hitting a cone on the
road that is 300 ft ahead. The driver’s reaction time is 1.5
second. When the driver first applies the brakes, a software flaw
causes the braking efficiency to lower to 0.8 for 100 ft. After the
initial 100 ft, the braking efficiency returns to 1.0. How fast
will the driver be going when...

A car traveling at 45 mph on a poor, wet pavement has a braking
efficiency of 87%. The brakes were applied 100 feet before hitting
an obstacle in the road. The road is uphill for 40 feet and then is
level for the remainder of the way. The car had a maximum
coefficient of road adhesion in the sloped portion of the poor, wet
roadway and but as soon as it started going on the level portion
its coefficient of...

A car traveling at 45 mph on a poor, wet pavement has a braking
efficiency of 87%. The brakes were applied 100 feet before hitting
an obstacle in the road. The road is uphill for 40 feet and then is
level for the remainder of the way. The car had a maximum
coefficient of road adhesion in the sloped portion of the poor, wet
roadway and but as soon as it started going on the level portion
its coefficient of...

A driver is traveling 120 km/h on a road with a negative 1%
grade. There is a stalled car on the road 310 m ahead of the
driver. The driver's vehicle has a braking efficiency of 90%, and
it has antilock brakes. The road is in good condition. What is the
minimum distance from the stalled car at which the driver could
apply the brakes and still stop before hitting it? (Assume
theoretical stopping distance, ignore air resistance, and frl...

A 4000 lb. car traveling at 80 mph on a level road locks its
wheels and decelerates at a constant rate. It slides 580 ft. before
it stops. Ignore the perception-reaction time of the driver.
Answer
A.) the time required to stop?
B.) acceleration during braking?
C.) frictional force between the tires and the road?
D.) Coefficient of friction between the tires and the road?

A car is traveling at 60 mph on a 4%
downgrade.
Then,
the driver sees a fallen tree
250
ft
ahead. The driver applies the brakes but still crashes into the
tree. The skid marks were found to be 100 ft long,
and
the coefficient of
braking was found to equal 0.50. Neglect aerodynamic resistance and
compute the following:
a)
The driver’s perception reaction time.
b)
The crashing speed of the vehicle.

A car of 1000 kg with good tires on a dry road can decelerate
(slow down) at a steady rate of about 5.0 m/s2 when braking. If a
car is initially traveling at 20 m/s (45 mi/h),
(a) How much time does it take the car to stop?
(b) What is its stopping distance?
(c) What is the deacceleration?
(d) How big is the net force to be applied to stop this car?
(e) Calculate the work done by this...

An automobile is traveling on a long, straight highway at a
steady 77.0 mi/h when the driver sees a wreck 200 m ahead. At that
instant, she applies the brakes (ignore reaction time). Between her
and the wreck are two different surfaces. First there is 100 m of
ice, where the deceleration is only 1.30 m/s2 . From then on, it is
dry concrete, where the deceleration is a more normal 7.60 m/s2
Part A.
What was the car’s speed...

When traveling 40 mph (miles per hour), the distance that it
takes Fred’s car to stop varies evenly between 120 and 155 feet.
(This includes the reaction distance and the braking distance.) All
of the questions are related to the stopping distance when Fred is
traveling 40 mph.
a) Let S be the distance it takes for Fred’s car to stop at when
traveling 40 mph. Find the distribution, parameter(s), and support
of S.
b) What is the probability that...

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