The portrayal of nearly all aliens in movies and on TV as being humanoid is
A) based on the fact that it would be impossible for us to understand anything that wasn't very similar to a human
B) realistic because the human form has several unique qualities that make it a good choice for any advanced civilization
C) based on the fact that the human form is the only possible form for an advanced civilization
D) probably unrealistic because the human form is most likely a result of the particular conditions and events that occurred on the Earth
D
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A container with rigid walls is filled with 4 mol of air with CV = 2.5R. How much does the internal (thermal) energy change if the temperature of the air rises from 16°C to 437°C? The ideal gas constant is R = 8.314 J/mol ? K
A) 35 kJ B) 421 J C) 3.5 kJ D) 8.75 kJ
A photocathode has a work function of 2.8 eV. The photocathode is illuminated with monochromatic radiation whose photon energy is 4.0 eV. The threshold frequency for photoelectron production is closest to:
A) 6.8 × 1014 Hz B) 2.9 × 1014 Hz C) 7.7 × 1014 Hz D) 8.6 × 1014 Hz E) 9.7 × 1014 Hz
A current may be induced in a coil by
a. moving one end of a bar magnet through the coil. b. moving the coil toward one end of the bar magnet. c. holding the coil near a second coil while the electric current in the second coil is increasing. d. all of the above. e. none of the above.
A 0.28-kg stone you throw rises 34.3 m in the air. The magnitude of the impulse the stone received from your hand while being thrown is
a. 0.27 N s. b. 2.7 N s. c. 7.3 N s. d. 9.6 N s. e. 34.3 N s.