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Two small liquid-propellant rocket motors are mounted at the tips of a helicopter rotor to augment power under emergency conditions. The diameter of the helicopter rotor is 7m, and it rotates at 1 rev/s. The air enters at the tip speed of the rotor, and exhaust gases exit at 500 m/s with respect to the rocket motor. The intake area of each motor is 20cm^2, and the air density is 1.2 kg/m^3. Calculate the power provided by the rocket motors. Neglect the mass rate of flow of fuel.
on a specific westbound section of highway studies show that the speed-density relationship is u= uf [1-(k/kf)^3.5] It is known that the capacity is 4200 veh/h and the jam density is 210 veh/mi.
Find the mass of air in a closed chamber measuring 35 ft by 20 ft by 10 ft, when the pressure is 17 lb/in^2 and the temperature is 75°F, assuming air to be an ideal gas
A four-lane freeway is on a mountainous terrain with 11-ft lanes, a 5-ft right-side shoulder, and a 3-ft left side shoulder. During the peak hour there are 12% trucks and buses and 6% recreational vehicles.
A well water has the following mineral contents in mg/L: Na+=20; K+=35; Ca+2 =15; Mg+2 =10; Sr=0.5; Cl- =40; HCO3- =65; CO3-2=5; SO4-2=15; and NO3=10.
The "supersoaker" water gun can shoot more than 30 ft in the horizontal direction. Estimate the minimum pressure, , needed in the chamber in order to accomplish this. List all assumptions and show all calculations.
The vehicle was estimated to hit the light pole at 30 mph. The skid was 650 feet long. How fast was the car traveling before applying the brakes
A 10-year $2000 Bond with a coupon rate of 10% paid semi-annually is available for purchase. What is the maximum you would pay for this bond if your MARR (without inflation) is 6%, and you estimate an inflation rate of 3% annually
Using 1630.56 kN as the ultimate capacity determine the diameter of a drilled shaft pile that would have the same ultimate capacity and depth embedment (11.5 m) using the FHWA method. Neglect shaft resistance. Use a F.S. of 2
By assuming a linear speed-density relationship, the mean free flow speed on a highway facility lane equals 65 mph. The jam density is observed to be about 170 vpm. 1. Plot the q-k-u curves
A one-way solid concrete slab is to be used for a simple span of 16 ft. In addition to its own weight, the slab carries a superimposed dead load of 50 psf and a live load of 75 psf.
Wastewater flow of 2000 m3/day containing 120g/L of salt. Discharge into a river with a flow of 34,000 m3/day and a salt concentration of 50 mg/l. The agency wants to maintain the salt level to no greater than 250 mg/L downstream of the discharge.
x=1.5t^4-30t^2+5t+10 where x and t are exprerssed in meters and seconds, respectively. Determine the psition, the velocity and the acceleration of the particle when t=4 seconds
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