ENGINEERING YOUR FUTURE
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Author: Oakes
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Chapter 13, Problem 13.4EAA
To determine
The procedure to build a paper airplane and compare it with other method of building the same plane.
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Exposure to high concentrations of gaseous ammonia can cause lung damage. The acceptable short term ammonia exposure level set by the occupational safety and health administration is 35 ppm for 15 min. consider a vessel filled with gaseous ammonia at 30 mol/L and 10 cm diameter circular plastic plug with thickeness of 2 mm is used to contain the ammonia inside the vessel. the ventilation system is capable of keeping the room safe with fresh air, provded that the rate of ammonia being release is below .2 mg/s. if the diffusion coefficient of ammonia through the plug is 1.3*10^-10 m^2/s, determine whether or not the plug can safelt contain the ammonia inside the vessel.
The state of stress at a point is σ = -8.00 kpsi, σy = 12.00 kpsi, σ% = -18.00 kpsi, Try = 7.00 kpsi,
Tyz = 4.000 kpsi, and Tzx = -18.00 kpsi.
Determine the principal stresses.
The principal normal stress σ1 is determined to be
kpsi.
The principal normal stress σ2 is determined to be
The principal normal stress σ3 is determined to be
kpsi.
kpsi.
The principal shear stress T₁
T1/2
is determined to be
kpsi.
The principal shear stress 72/ is determined to be [
kpsi.
The principal shear stress T1/3
is determined to be
kpsi.
The constant 180 N-m
counterclockwise couple acts on the L-shaped rod ABC, which
rotates freely in the vertical plane about the pin at A. At this
moment, the angular velocity of the rod is 2 rad/s
counterclockwise. Determine the angular acceleration of the rod
and the reactions at A in the position shown.
Answer: a=1.7 rad/s², Ax = 25.3 N, Ay = 603 N
180 N-m
1.2 m
24 kg
20 kg
B
1.0 m
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