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A cantilevered steel pipe tower, 80 m tall is being considered for a new wind turbine. The weight of the turbine is 3,400 kN. The tower under consideration will have a constant outer diameter of 4 m and a wall thickness of 6 cm. The turbine is to have three blades. The nominal rotor speed is 12 rpm. Would the tower be considered stiff, soft or soft–soft? Suppose that a tapered tower is being considered instead. How would the natural frequency be analyzed? Assume that the weight density of steel is 76.8 kN/m3 and its elasticity is 2.07 x 1011 Pa.
Briefly explain the difference between fatigue striations and beachmarks in terms of both size and origin.
Consider a piston/cylinder with .5kg of R-134a as saturated vapor at -10C. It is now compressed to a pressure of 500kPa in a polytrophic process with n=1.5. Find the final volume an temperature and determine the work done during the process?
Water enters a 2 meter diameter pipe at a temperature of 23 deg C. The water leaves the pipe at a temperature of 97 deg C The laminar flow rate is such that the Reynolds number is 800. What is the mass flow rate?
Consider a flat plate mounted in the test section of a supersonic wind tunnel – assume the nozzle is perfectly expanded. The plate is at an angle of attack of -10° and the static pressure on the bottom surface of the plate is 1.0 atm. The nozzle thro..
what is an exergy factor? 8 what is a pinch point and what is it used for? 9 what does the compressor in figure 2 do?
How much energy (kJ) is required to accelerate a 1500 kg passenger vehicle from rest to highway speed (110 km/hr)? If it takes fifteen seconds to accelerate the vehicle, what is the average power (kW)?
an ideal brayton cycle with pressure ratio of 8.95 and air enters the compressor at 285k. find the amount of work in
solve using moodys diagram. on a farm water is delivered from a pressurized storage tank to an animal watering trough
the distance required to stop an automobile consists of both thinking and braking components each of which is a
consider two identical rooms one room has a refrigerator in it the other does not. all the doors and windows in each
You are a thermal design engineer and plan to design cooling solution for computer chip. As a basic design, a chip (kc = 50 W/m-K) is mounted in a dielectric substrate (ks = 5.0 W/m-K) and one surface of the system is convectively cooled, while the r..
oil viscosity 0.003 pa s specific gravity 0.85 is confined between two concentric circular cylinders of infinite
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