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An existing high-way railway at-grade crossing is being redesigned as a grade seperated to improve traffic operations. the railway must remain at the same elevation. the highway is being reconstruct
at one point on the highway, a 720 ft equal-tangent crest vertical curve exists. measurements show that at 3+40 stations from the PVC, the vertical curve offset is 3.5 ft. assess the adequacy of thi
How are compacted and loose bulk density used in real life. Also is a high degree of accuracy necessary in the bulk density tests
An air-filled rubber ball has a diameter of 6 in. If the air pressure within it is increased until the ball's diameter becomes 7 in., determine the average normal strain in rubber.
Assume the actual water temperature for calibrating a 1/3 ft3 measure was 65 degrees F. If you had used a water temperature of 75 degrees F for your calibration, how much error would there be in you
A steel bolt and nut are tightened around an aluminum sleeve. Find the internal forces as the nut is rotated 1 turn
The 2 Mg car is being towed by a winch. If the winch exerts a force of T=105s on the cable, where 14m is the displacement of the car in meters, determine the speed of the car when s , starting from
Ammonium (NH4+) is a weak acid with a pKa of 9.26. The dissociation is: NH+4 <--> NH3 + H+. Calculate the mass of ammonium added to 1 L of water in order to obtain a pH of 4 at equilibrium.
The owners wish to achieve an initial acceleration from rest of 22 ft/(sec^2) on a level paved surface. What is the minimum coefficient of road adhesion needed to achieve this acceleration
A 3000-lb car has a maximum speed (at sea level and on a level, paved surface) of 140 mi/h with 16" radius wheels, a gear reduction of 3.5 to 1, and a drivetrain efficiency of 92%. It is know that a
The road is in good, dry conditions until 160 ft before the stalled car where it is wet and stays wet for the remaining length. What is the minimum distance from the stalled car at which the driver
A 3400-lb car is traveling in third gear (ratio 2.5 to 1) on a level road at its top speed of 130 mi/h. The air density is 0.00206 slugs/cuft. The car has frontal area of 19.8 sqft, a drag coefficie
The driver strikes the sign at a speed of 25 mi/h. If the student was traveling at 55 mi/h when the sign was spotted, what was the drivers associated reaction time in seconds
The flow in the river is 30ft^3/min and the first-order rate constant for disinfection is 6min^-1. 1)What kind of hydrodynamic model should you use. 2) write the mass balance equation for microorgan
A 10 kg block is being pulled down a slope with an angle of 20 degrees and has a velocity of .2 m/s. Determine the force required
A 25-mm-diameter shaft .5 m long is pulled through a cylindrical bearing. The lubricant that fills the 0.3-mm gap between the shaft and bearing is an oil having a kinematic viscosity of 8.0 ×
A jet aircraft flies at a speed of 600 mph at an altitude of 40,000 ft. The atmosphere is the standard atmosphere. (1) What is the air pressure outside the aircraft (2) What is the Mach number of th
If given a brittle material with a known tensile strength, Sut, and a known compressive strength, Suc, use the four main fracture criteria (MNSC, BCM, MM, and MIIM) to determine the shear stress, ta
A large tank is used to calibrate the reading from a flow meter. Measurements of the system weight as a function of time are made. Water enters the tank vertically from the flow metering system at a
Write the mass balance equation for a plug flow with a second order decaying substance,C. Solve for the steady state concentration of C as a function of the second order rate constant k, longitudina
Write the mass balance equation for an ideal 1D plug-flow stream under steady state conditions with a first-order decaying substance. Solve for the concentration as a function of the concentration x
A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB= 1.25 in, tAB= 0.5 in, dBC= 2.25 in and tBC= .375
water flows from a lake into a steep natural channel. the water surface elevation of the lake is 97.0 with respect to the datum. the channel properties are given below. determine the flow rate in th
Water is flowing at a depth of 10 ft with a velocity of 10 ft/s in a channel of rectangular section. Find the depth and change in water surface elevation caused by a smooth upward step in the channe