As an electron moves closer to the nucleus, it ________ energy.
A. generates
B. absorbs
C. quantizes
D. loses
E. gains
Answer: D
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When the temperature of the Sun's core goes up, what happens next?
A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.
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
How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder. B. It is not exploding. C. It is not collapsing. D. All of these choices are correct. E. None of these choices are correct.
What is the speed of sound in the air inside a furnace where the temperature is 500 degrees Celsius (773 Kelvin)?