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A 100-ton train traveling on a horizontal track requires 400 hp to maintain a constant speed of 50 mi/h. Determine
(a) the total force needed to overcome axle friction, rolling resistance, and air resistance,
(b) the additional horsepower required if the train is to maintain the same speed going up a 1-percent grade.
What is the major advantage of a dual-media coal-sand filter compared with aconventional sand filter?
Compute the amount of chlorine required for disinfection in pounds per day(lb/d). Estimate the annual cost for disinfection using chlorine. Flow Rate= 30 milloin gallons per day.
an electric motor is rated at 10 horsepower hp and costs 800. its full load efficiency is specified to be 85. a newly
In an oedometer test, the void ratio of a clay sample changed from 1.62 to 1.41 as the vertical effective stress imposed on the sample was increased from 100 kPa to 200 kPa. Later on, the vertical effective stress on the sample was decreased
Diesel fuel has an average chemical formula of C12H23 and a density of 6.45 lb/gal. Calculate how many lbs of CO2 are produced per gallon of diesel burned (assume complete combustion).
what is the chemical composition of steel and what is the effect of carbon on the mechanical properties of steel
A city near the epicenter of an earthquake sustains major damage to poorly constructed building, althought hospital and schools designed to resist dmage from ground motion sustsain only minor damage.
Calculate the drawdown at the well (use r which is the distance from the pumping well = 18 in) with total withdrawals from storage after (a) 1 min, (b) 1 h, (c) 1 day, (d) 1 month, and (e) 1 yr of continuous pumping, at design capacity.
The James Rives flows in from the East at 320 m^3/min and joins the Jackson River flowing at 605 m^3/min just outside the town of Charlotte, NC. The concentration of BOD in the James River is 14 mg/L
Two vessels are connected to a differential manometer using mercury (s=13.56), the connecting tubing being filled with water. The higher-pressure vessel is 5 ft lower in elevation than the other
A froth flotation process is used to concentrate copper ore. It is a two stage process with a rougher stage followed by a cleaner stage. The cleaner tailings are returned to the rougher flotation.
A particle moves along the positive x-axis with an acceleration in meters per second squared which increases linearly with x expressed in millimeters, as shown on the graph for an interval of its motion.
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