Question

A driver is traveling 120 km/h on a road with a negative 1% grade. There is...

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 = 0.012.

Engineering   Civil-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A car is traveling up a 1.5% grade at 65 mi/hr on good, wet pavement. The...
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...
Two cars are traveling on level terrain at 60 mi/h on a road with a coefficient...
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...
The driver of a one ton car traveling at 126 km/hr suddenly used his brake to...
The driver of a one ton car traveling at 126 km/hr suddenly used his brake to stop before hitting a stationary lorry ahead. After the brakes are applied, a constant kinetic friction force of magnitude 8 kilo Newton acts on the car. Ignore air resistance. (a) At what minimum distance should the brakes be applied to avoid a collision with the other vehicle? (b) If the distance between the vehicles is initially only 30.0 m, at what speed would the...
A car is traveling at 60 mph on a 4% downgrade. Then, the driver sees a...
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 traveling at 45 mph on a poor, wet pavement has a braking efficiency 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 car traveling at 45 mph on a poor, wet pavement has a braking efficiency 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 car is traveling at 47.0 km/h on a flat highway. (a) If the coefficient of...
A car is traveling at 47.0 km/h on a flat highway. (a) If the coefficient of friction between road and tires on a rainy day is 0.107, what is the minimum distance in which the car will stop? I kept getting 86.96302602 and it was wrong (b) What is the stopping distance when the surface is dry and the coefficient of friction is 0.535?
A 1,500 − ?? car is traveling at 100 ??/h. The driver sees a slow truck...
A 1,500 − ?? car is traveling at 100 ??/h. The driver sees a slow truck ahead and slows down to 60 ??/h. a. Find the initial and final energy of the car and the work done on it to slow it down. b. If the car completes its deceleration in 9.0 ?, find the mean braking power. c. A typical car can be made to stop from 100 ??/h in a minimum distance of 60 ? if the pavement...
When traveling 40 mph (miles per hour), the distance that it takes Fred’s car to stop...
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...
1.A boy jumps from rest, straight down from the top of a cliff. He falls halfway...
1.A boy jumps from rest, straight down from the top of a cliff. He falls halfway down to the water below in 0.756 s. How much time passes during his entire trip from the top down to the water? Ignore air resistance. t = ? 2.An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +15.7 m/s and measures a time of 10.5 s before...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT