Question
In: Physics
An automobile is traveling on a long, straight highway at a steady 75.0 m/h when the...
An automobile is traveling on a long, straight highway at a steady 75.0 m/h when the driver sees a wreck 170 m ahead. At that instant, she applies the brakes (ignore reaction time). Between her and the wreck are two different surfaces. First there is 140 m of ice, where the deceleration is only 1.20 m/s^2 . From then on, it is dry concrete, where the deceleration is a more normal 7.90 m/s^2 . What was the car’s speed just after leaving the icy portion of the road? What is the total distance her car travels before it comes to a stop? What is the total time it took the car to stop?
Solutions
genius_generous answered 7 months agoRelated Solutions
A 1500 kg automobile travels at a speed of 85 km/h along a straight concrete highway....
A 1500 kg automobile travels at a speed of 85 km/h along a
straight concrete highway. Faced with an emergency situation, the
driver jams on the brakes, and the car skids to a stop.
(a) What will be the car's stopping distance for dry pavement (µ
= 0.85)?
(b) What will be the car's stopping distance for wet pavement (µ
= 0.60)?
A motorcycle is following a car that is traveling at constant speed on a straight highway....
A motorcycle is following a car that is traveling at constant
speed on a straight highway. Initially, the car and the motorcycle
are both traveling at the same speed of 21.5 m/s , and the distance
between them is 60.0 m . After t1 = 5.00 s , the motorcycle starts
to accelerate at a rate of 8.00 m/s2 . The motorcycle catches up
with the car at some time t2.
How long does it take from the moment when...
A motorcycle is following a car that is traveling at constant speed on a straight highway....
A motorcycle is following a car that is traveling at constant
speed on a straight highway. Initially, the car and the motorcycle
are both traveling at the same speed of 21.0 m/s , and the distance
between them is 60.0 m . After t1 = 4.00 s , the
motorcycle starts to accelerate at a rate of 7.00 m/s2 . The
motorcycle catches up with the car at some time t2.
B) How long does it take from the moment...
A motorcycle is following a car that is traveling at constant speed on a straight highway....
A motorcycle is following a car that is traveling at constant
speed on a straight highway. Initially, the car and the motorcycle
are both traveling at the same speed of 18.0m/s , and the distance
between them is 54.0m. (A) How long does it take from the moment
when the motorcycle starts to accelerate until it catches up with
the car? In other words, find t2-t1. (B) How far does the
motorcycle travel from the moment it starts to accelerate...
An automobile has a vertical radio antenna 1.10 m long. The automobile travels at70.0 km/h on...
An automobile has a vertical radio antenna 1.10 m long. The
automobile travels at70.0 km/h on a horizontal road where the
Earth's magnetic field is 50.0 µT, directed toward the north and
downwards at an angle of 65.0° below the horizontal.
(a) Specify the direction the automobile should move in order
to generate the maximum motional emf in the antenna, with the top
of the antenna positive relative to the bottom.
(b) Calculate the magnitude of this induced emf.
A football quarterback is traveling straight backward at a speed of 5.1 m/s when he throws...
A football quarterback is traveling straight backward at a speed
of 5.1 m/s when he throws a pass to a receiver 15.5 m straight
downfield.
(a) If the ball is thrown at an angle of 25° relative to the
ground and is caught at the same height as it is released, what is
its initial speed relative to the ground in m/s?
(b) How long does it take to get to the receiver in s?
(c) What is its maximum...
A highway curve with a radius of 450 m is banked properly for a car traveling...
A highway curve with a radius of 450 m is banked properly for a
car traveling 80 km/h. If a 1560- kg Porshe 928S rounds the curve
at 250 km/h, how much sideways force must the tires exert against
the road if the car does not skid?
A highway curve with a radius of 750 m is banked properly for a car traveling...
A highway curve with a radius of 750 m is banked properly for a
car traveling 120 km/h. If a 1600- kg Porshe 928S rounds the curve
at 230 km/h, how much sideways force must the tires exert against
the road if the car does not skid?
A road perpendicular to a highway leads to a farmhouse located 1 mile away. An automobile traveling on the highway passes through this intersection at a speed of 65mph.
part 1)
A road perpendicular to a highway leads to a farmhouse located 1 mile away. An automobile traveling on the highway passes through this intersection at a speed of 65mph. How fast is the distance between the automobile and the farmhouse increasing when the automobile is 6 miles past the intersection of the highway and the road? The distance between the automobile and the farmhouse is increasing at a rate of miles per hour.
part 2)
A boat...
a car is traveling along a straight road when the car runs out of gas. the...
a car is traveling along a straight road when the car runs out
of gas. the car has an acceleration a(t)=1.1m/s^2-.02m/s^3*t and
has a velocity of 30.0m/s at t=0.
a) what is the displacement of the car between t=3.0 s and t=5.0
s?
b) at what time will the car become to rest?
c) what will be the total displacement of the car between t=0
and when it comes to rest?
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