HEAT&MASS TRANSF. (LL) W/CONNECT<CUSTOM>
6th Edition
ISBN: 9781266141652
Author: CENGEL
Publisher: MCG
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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
Circular fins of uniform cross section, with diameterof 10 mm and length of 50 mm, are attached to a wallwith surface temperature of 350°C. The fins are made ofmaterial with thermal conductivity of 240 W/m·K, and theyare exposed to an ambient air condition of 25°C and the convectionheat transfer coefficient is 250 W/m2·K. Determinethe heat transfer rate and plot the temperature variation of asingle fin for the following boundary conditions:(d) Convection from the fin tip
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