The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature
a. True
b. False
Indicate whether the statement is true or false
True
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A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
A prismatic shaft (diameter d0 5 19 mm) is loaded by torque T1. A stepped shaft (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by torque T2. The allowable shear stress in the material is 42 MPa. The ratio T1/T2 of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
Why is the air over an open flame always moist?
A) The hot flame vaporizes the water in the air above the flame. B) One of the products of combustion is water vapor. C) Warm air contains more humidity than cold air. D) None of the above is true.
Indicators of Slope Failure
What will be an ideal response?