A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
(A) 138 kN
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Total internal reflection
A. Accounts for the brilliance of cut diamonds. B. Allows light to travel in a curved path inside an optic fiber. C. All of these are true. D. Occurs when light strikes an interface at greater than the critical angle.
The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
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If a certain sample of an ideal gas has a temperature of 104°C and exerts a pressure of 2.3 × 104 Pa on the walls of its container,
how many gas molecules are present in each cubic centimeter of volume? The ideal gas constant is R = 8.31 J/mol × K and Avogadro's number is NA = 6.022 × 1023 molecules/mol.
While none yet exist, in the very distant future, black dwarfs will comprise the majority of the "normal matter" of the universe
Indicate whether the statement is true or false