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Annual maintenance cost for a particular section of highway pavement are $2000. The placement of a new surface would reduce the annual maintenance cost to $500 per year for the first 5 years and to $1000 per year for the next 5 years. After 10 years the annual maintenance would again be $2000. If the maintenance costs are the only saving, what investment can be justified for the new surface? Assume interest at 4%.
Estimate the hourly production and unit cost of rock excavation by drilling and basting. The rock is limestone having a seismic velocity of 6000 ft/s. Trial blasting indicates that 3" holes drilled in 12 ft.
A U manometer reads 20 cm air as operating fluid and a given manometric fluid. A single branch closed tube reads 35 cm connected to point 1. If P2 = 1.2 ATM calculate the pressure in point 1 and the density of the manometric fluid.
You try to freeze one liter of water at 10 degrees Celsius in ice trays in your freezer. Your freezer has a coefficient of performance of 5.5 and a power rating of 550 Watts, though only 10% of the power will go into freezing the ice.
A manometer of water reads a height of 20cm at a temperature of 15 degrees C. If the diameter of the manometer tube is 1mm, what is the static height reading
You are to assume that seawater at 77oF will be used in the tank and the curved portion forms a quarter of a circle. The tank is open to the atmosphere. The overall height, h2, is 20ft deep. The radius of the curve, R, is 5ft. The width of the..
A floor slab has a fundamental bending frequency of 10Hz. A shaker is placed at the centre of the slab for a dynamic testing. The tests confirm that the slab displays a damping ratio of 2% of critical.
Solid waste production in the United states was 4.3lbs/person-day. Calculate the potential methane production in one year for a land fill that serves a community of 50,000 people.
A triaxial test was performed on a dry, cohesionless soil under confining pressure of 144 kN/m^2. If the sample failed when the deviator stress reached 395.8 kN/m^2, determine the soil's angle of internal friction.
The barrel has an inner diameter of 4ft. Neglect its wall thickness. Assume that only the hoops resist the water pressure. Note: Water develops pressure in the barrel according to Pascal's Law, p=62.4 lb/ft^2, where z is the depth from the surface..
1.a rectangular concrete channel is 3 m wide and 2 m high. the water 20 deg celsius in the main channel is 1.5 m deep
Determine the power generated by the turbine (in KW) operating in steady state at 5MPa, with specific enthalpy 3000kj/kg and velocity of 10m/s at the entrance and steam escaping at 0.07MPa, specific enthalpy 2000kj/kg at velocity of 90m/s p.
A 2,400 foot long, 2 foot diameter pipline conveys water from a hilltop reservoir to an industrial site. The pipe is made of ductile iron, has an outside diameter of of 2.25 feet, and has expansion joints.
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