Answered: ntal cross-sectional area of 20 ft2.…

ntal cross-sectional area of 20 ft2. The roadway has a straight alignment and a badly broken and patched asphalt surface

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter21: Pavement Management

Section: Chapter Questions

Problem 10P

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Question

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Estimate the horsepower required to accelerate a 2,500-lb vehicle traveling 30 mph up a 5% grade at the rate of 6 ft/sec². The vehicle has a frontal cross-sectional area of 20 ft2. The roadway has a straight alignment and a badly broken and patched asphalt surface Assume the drag coefficient = 0.3 and a rolling resistance =34 Use the following: (a) Inertia resistance, F, =? (compute) (b) Grade resistance, F =? (compute) (c) Rolling resistance, F, = 34 lb (d) Curve resistance, F = 0 (e) Air resistance; Use the formula :F= 0.0006AV² (f) Horsepower

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The braking distance of a car from 90 km/h is 40 m assuming the pavement is level. (a) if the pavement is with 5° inclination, what will be the braking distance (in meter) of the car going up from 90km/h? (b) and if the car is going down at 6% inclination, what is its braking distance (in meter) from 90km/h? Note: Assume the breaking force is not dependent of the grade. Select the correct response(s): O 42.71 O 45.78 O 52.34 O 43.25 O 54.12 O 46.77 O 34.30 O 36.05 O 44.13 O 40.95 O 41.96 O 50.90 O O O O O O O O O
The braking distance of a car from 120 km/h is 50 m assuming the pavement is level. (a) if the pavement is with 6° inclination, what will be the braking distance (in meter) of the car going up from 120km/h? (b) and if the car is going down at 2% inclination, what is its braking distance (in meter) from 120km/h? Note: Assume the breaking force is not dependent of the grade.
really need help asap pls
The braking distance of a car from 120 km/h is 50 m assuming the pavementis level. (a) if the pavementis with 6° inclination, what will be the braking distance (in meter) of the car going up from 120km/h? (b) and if the car is going down at 2% inclination, what is its braking distance (in meter) from 120km/h? Note: Assume the breaking force is not dependentof the grade. Select the correctresponse(s): 50.90 O 41,96 O 46,77 O 54.12 O 36.05 O 45.78 O 42.71 O 40.95 O 34.30 O 43.25 44.13 O 52.34
Help mee pleasee. Complete solution
1. The driver of a vehicle traveling at 80 kph up a grade requires 9 m less to stop after he applies the brakes than the driver travelling at the same initial speed down the same grade. If the coefficient of friction between the tires and pavement is 0.50, what is the percent grade and what is the braking distance down the grade. V,=80 kph V2=0 brakes are applied S-9 V,=80 kph V2=0 brakes are applied -S-
A 1000kg car rounds a curve on a flat road of radius 50m at a speed of 50kph. Compute the maximum coefficient of friction must the pavement have to prevent the car from sliding?
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Coefficient of friction between the tires and the roadway depends a lot on final vehicle speed True O False O
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