Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe.
C) The galactic civilization is deliberately avoiding contact with us.
D) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy.
A) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
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For a fluid having density of 682 kg/m^3 (42.6 lbm/ft^3), viscosity of 0.28 g/ms (1.88 x 10^-4 lbm/ft?s), and thermal conductivity of 0.562 W/mK (0.325 Btu/hr?ft?0F), what is its Reynolds number when flowing at 10 m/s (32.8 ft/s) through a 20 cm (7.87 in) diameter tube?
What will be an ideal response?
A girl lifts a ball by means of a string attached to the ball. The string exerts a 20 newton force on the ball. The ball weighs 8 newtons. The net force on the ball is
A) zero. B) 28 newtons. C) 12 newtons. D) 20 newtons. E) 8 newtons.
Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth
Compared to the twin who remained on Earth, the astronaut twin is A) the same age as the Earth-twin. B) younger than the Earth-twin. C) older than the Earth-twin. D) The ages cannot be determined from the information provided.
The idea that light could be emitted only in discrete chunks, or quanta, instead of in continuous amounts was first put forth to explain which of the following phenomena?
A. X-rays B. Blackbody radiation C. Cathode rays D. Radioactive decay E. The spectrum of atomic hydrogen