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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.
A constant power of 1.5 hp is supplied to the motor while it operates with an efficiency of ε = 0.8. Determine the velocity of the 200-lb crate in 15 seconds, starting from rest. Neglect friction.
Find the uniform annual amount that is equivalent to a uniform gradient series in which the first year's payment is $500, the second year's payment is $600, the third year's payment is $7000,
A race car C is being tracked via telemetry. The on-board acclerometer records and acceleration level of -.7get+.5gen. If you know that the v at this instant is 200km/hr, what is the tracks radius of curvature at this instant
A train of total mass equal to 500 Megagrams starts from rest and accelerates uniformly to a speed of 90 km/h in 50 s. After reaching this speed, the train travels with a constant velocity.
compressed nitrogen (140 lbm) is stored in a spherical tank of diameter D = 2.5 ft @ temp. of 77 degrees Fahrenheit . what is the pressure inside the tank? if the max allowable stress is 30 ksi, find the minimum theoretical wall thickness.
A wastewater treatment plant has a flow of 30 mgd. The influent BOD is 250 mg/L. Assume that 30% of the BOD is removed in the primary clarifiers. The plant is designed to carry 3,000 mg/L of VSS in the aeration basin.
Determine the operating speeds of the machine at which the machine's steady-state amplitude is less than 0.2 mm. Take keq = 3 EI/L3.
The specific yield of an unconfined aquifer is Sy = 0.15. How much, on average, would the water table need to be lowered (in m) in an area of 2.5 km^2 to release 6.5 x 10^5 m^3 of water from storage in this aquifer
assume hydrostatic uplift varies uniformly from full hydrostatic head at the heel of the dam to zero at the toe. consider 1m length of dam.
The uniform load has a mass of 400 and is lifted using a uniform 40- strongback beam and four ropes. determine the tension in each rope
A cutting 9 m deep is to be excavated in saturated clay of unit weight 19 kN/m3. The design shear strength parameters are cu = 30 kN/ m2 and fu = 0. A hard stratum underlies the clay at a depth of 11 m below ground level.
For load combination 1.2D + 1.6L, determine the maximum negative moment in each span and maximum negative moment at each support. remember that live loads shall be placed so as to cause the greatest effect.
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