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CE361.EX1-Review-12 - PVC What is the stationing and...

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CE 361 Mid-Term Exam Review (Open Book) Problem 2.9 from text 1. A 2150-lb car is traveling at sea level at a constant speed. Its engine is running at 4500 rev/min and is producing 150 ft-lb of torque. It has a drivetrain efficiency of 90%, a drive axle slippage of 2%, 15-inch–radius wheels, and an overall gear reduction ratio of 3 to 1. If the car’s frontal area is 19.4 ft 2 , what is its drag coefficient? Problem 3.13 from text 2. A vertical curve is designed for 55 mi/h and has an initial grade of +2.5% and a final grade of 1.0%. The PVT is at station 114 + 25. It is known that a point on the curve at station 112 + 75 is at elevation 240 ft. What is the stationing and elevation of the
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Unformatted text preview: PVC ? What is the stationing and elevation of the high point on the curve? Problem from 2010 mid-term 3. A horizontal curve on a 4-lane highway (two lanes each direction with no median) has a superelevation of 6% and a central angle of 40 degrees. The PT of the curve is at station 322+50 and the PI is at 320+08. The road has 10ft lanes and 8ft shoulders on both sides with high retaining walls going up immediately next to the shoulders. What is the highest safe speed of this curve (highest in 5mi/h increments) and what is the station of the PC ?...
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