Answered: car traveling at 60 kph stopped 30 m…

car traveling at 60 kph stopped 30 m from the point the driver stepped on the brake. Determine the coefficient of skidding resistance between

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Problem 1. In deriving braking distance, we assume a constant acceleration/deceleration rate, a. In fact, AASHTO assumes constant acceleration a(t): = c (constant) in most of its design procedures. Although this is not entirely true, distances required for acceleration or deceleration can be realistic if appropriate values are chosen for the constant acceleration process. Linear acceleration a(t) = c₁t (t is time elapse and c₁ is jerk rate or rate of change) is a better approximation to the acceleration process. a) What is the practical stopping distance for a vehicle with initial speed 70 mph, if acceleration is described by a linear function of time using a(t) = -1.8t (t is time elapse in seconds). b) Use a constant acceleration rate to achieve the same stopping distance. What is this constant acceleration rate? Problem 2. A car hits a tree at an estimated speed of 25 mph on a 3 % upgrade. If skid marks of 120 ft are observed on dry pavement (coefficient of braking friction, fo…
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 road adhesion reduced to 0.3. Assuming that the car struck the obstacle at 30 mph, what was the grade of the hill? Assume practical stopping distance equation applies.
A car travels around a curve with a radius of curvature of 60 meters. If the coefficient of friction is 0.2, what must be the banking angle of the curve so that so that the frictional resistance is zero?
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A 11,455 kN car has a 4,915 mm wheelbase, with its center of gravity located 536 mm from the pavement and 1,226 mm behind the front axle. Five people weighing on average 75 kg each loaded the vehicle, shifting the center of gravity 138 mm nearer to the rear axle. What is the maximum tractive effort (N) that can be developed if the car is a rear wheel drive? Use coefficient of road adhesion=0.55.
Answer the following question.
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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.
A collision occurred between a 1540 kg automobile (A) struck a stopped 890 kg automobile (B). All of the wheels of B were locked, and it slid 6 m after the impact. The coefficient of kinetic friction between B's tires and road was estimated to be u k = 0.8 and the coefficient of restitution of the impact to be e = 0.2. Determine automobile A's velocity in meters per second, just before the impact? Note: You can assume that there was a single impact. VA A B
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