Answered: v₁ = 44 ft/s d

Engineering

Civil Engineering

v₁ = 44 ft/s d

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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A test driver’s perception-reaction time is being conducted on a special testing track with wet pavement and a driving speed of 50 kph. When the driver is sober, a stop can be made just in time to avoid hitting the object that is visible 40m. ahead. After a few drinks of San Miguel beer, under exactly the same condition, the driver fails to stop in time and strikes the object at speed of 30 kph. Determine the driver’s perception-reaction time after he was drinking. Assume coefficient of friction is 0.6
Braking test 2. For another test of the tires, a car made repeated stops from 60 miles per hour. The test was run on both dry and wet pavement, with results as shown in the table. (Note that actual braking distance, which takes into account the driver’s reaction time, is much longer, typically nearly 300 feet at 60 mph!) a) Write a 95% confidence interval for the mean dry pavement stopping distance. Be sure to check the appropriate assumptions and conditions, and explain what your interval means. b) Write a 95% confidence interval for the mean increase in stopping distance on wet pavement. Be sure to check the appropriate assumptions and conditions, and explain what your interval means. Stopping Distance (ft)Dry Pavement---Wet Pavement 145 211 152 191 141 220 143 207 131 198 148 208 126 206 140 177 135…
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A typical reaction time to get your foot on the brake in your car is 0.2 seconds. If you are traveling at a speed of 82 kph, what distance will your car travel during this reaction time? Express your answers in meters.