Which of the following molecules is most likely to show a dipole-dipole interaction?
A) H2S
B) CO2
C) CH4
D) H-CImageC-H
E) none of the above
Answer: A
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How should the control volume method be implemented at an interface between two materials with different thermal conductivities? Illustrate with a steady, one-dimensional example. Neglect contact resistance.
GIVEN
• Interface between two different materials with different thermal conductivities
FIND
(a) Difference equation at the interface
ASSUMPTIONS
• No heat generation
SKETCH
Unpolarized light is passed through a polarizer-analyzer combination. The transmission axes of the polarizer and the analyzer are at 30.0° to each other. What percentage of the unpolarized light gets through the combination?
A) 37.5% B) 50.0% C) 63.7% D) 75.0% E) 100%
Sputnik I was launched into orbit around Earth in 1957
It had a perigee (the distance from the point of closest approach to the center of Earth) of 6.61 × 106 m and an apogee (the distance from the furthest point in the orbit to the center of Earth) of 7.33 × 106 m. Its mass was 83.5 kg. What was the difference in kinetic energy as it moved from perigee to apogee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 8.27 × 107 J B) 6.44 × 107 J C) 1.93 × 108 J D) 3.50 × 108 J E) 4.94 × 108 J
During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done in the process?
A) zero B) 2.0 J C) 5.0 J D) -5.0 J E) none of the above