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For a tall column resting on the ground, axial stress develops due to the columns weight. (a) Derive the stress as a function of position z measured from the bottom of the column, and the total contraction of the column. Express the results in terms of the column cross-sectional area A, mass density p, modulus E, and height H. (b) Evaluate the maximum stress and total contraction of height for a case of a hollow steel tower that is 70 m tall and has a 3.4 m outer diameter and wall thickness of 25 mm. Density and Youngs modulus of steel is given by 7850 kg/m3 and 200 GPa.
Air enters an adiabatic compressor at 0.1 kg/s, 100 kPa, 25 °C and exits at 700 kPa. (a) Draw a schematic of the system. Determine (b) the minimum power input (kW) and (c) the entropy generation rate (kW/K)
a sky diver with a mass of 70 kg jumps from an aircraft. the aerodynamic drag force acting on the sky diver is known to
A piston-cylinder assembly undergoes a cycle consisting of the following three processes: Compression with constant internal energy. Constant-pressure expansion with W_3-1=12.5 kJ
a curve of radius 200m on a level road is banked correctly for a speed of 65 kmh. if an automobile of mass 2 mg rounds
a hydraulic system has a mechanical advantage of 4. If a smaller piston has a diameter of 5 inches what is the diameter of the larger piston?
the diffusion coefficients for carbon in nickel are 5.5 x 10-14 m2s at 600 degc and 3.9 x 10-13 m2s at 700 degc
the temperature and pressure at the surface of mars during a martian spring day were determined to be -56 oc and 433 pa
estimate the specific molar volumes in cm3mol using the peng-robinson equation of state for nitric oxide at 150 k
a closed rigid tank whose volume is 1.5 m3 contains refrigerant 134a initially a two phase lipuid-vapor mixture at 10c.
two uninsulated rigid tanks contain air. initially tank a hold 1 lbm of air at 1440 degrees r and tank b has 2 lbm of
consider an accelerometer with a natural frequency of 800 hz and a damping ratio of 0.6. determine the frequency range
the particle a is mounted on a light rod pivoted at o and therefore is constrained to move in a circular arc of radius
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