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A small truck is to be driven down a 4% grade at 70mi/hr. The coefficient of road adhesion is 0.95, and it is known that the baking efficiency is 80% when the truck is empty and decreases by one percentage point for every 100 lb of cargo added. Ignoring aerodynamic resistance, if the driver wants the truck to be able to achieve a minimum theoretical stopping distance of 275 ft from the point of brake application, what is the maximum amount of cargo (in pounds) that can be carried.
A 10 feet thick clay that was unsaturated with a unit weight of 108 pcf and a water content of 20% gets saturated and also swells by 20% due to rain. G=2.70.
An open, clean glass tube (theta = 0 degrees) is inserted vertically into a pan of water. What tube diameter is neededif they water level in the tube is to rise one tube diameter (dueto surface tension)
(a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?
A pipe carrying oil of specific gravity (SG = 0.877) changes in size from 150 mm at section E to 450 mm at section R (E and R are arbitrary designations of the two points in the system). Section E is 3.66 m lower than R
If the coefficient of kinetic friction between the 12.5 mm diameter axles and the wheels is mu_k = .3, determine the radius of the wheels. neglect rolling resistance of the wheels on the surface.
the vertical portion of the press shown below consists of rectangle tube of wall thickness t=8mm. knowing that the press has been tightened on wooden planks being glues together until P = 20 kN,
A rigid tank contains 40 lbm of air in 20 psia and 70 degrees F. More air is added to the tank untill the pressure and temperature rise to 35 psia and 90 degrees F, respectively.
The City of Leadville (dimensions 120 * 120 km ) is characterized by an average daily emission rate of 4700 kg/d of particulate lead into the atmosphere from auto exhaust and industrial processes.
A 2000-lb wheel load is to be supported by aggregate over soil with a maximum bearing pressure of 1000 lb/sqft. What depth of aggregate is needed if the angle theta is 40 degrees
Design a series of closely spaced parallel box beams that will support an asphalt road surface over a 10 foot wide, 40 foot long span. The hollow box beams are made of concurred and imbedded No. 8 steel rods (1 inch dia.).
A 5 cm diameter, 6 m high pole is fixed in concrete. The pole supports a circular 4 m diameter sign. Estimate the maximum moment that must be resisted by the concrete for a wind speed of 30 m/s (wind is assumed normal to the sign; density of air = 1...
Determine the size (liters/hour) of a proportioning pump to feed ferric chloride for a 0.438 m^3/s water treatment plant. The optimum dose selected is 50 mg/L.
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