Why are type O, A, and M stars considered poor candidates to find a technological civilization?
What will be an ideal response?
Considering the time it took life on Earth to arise, type O and A stars have too short a lifetime to give life a chance to evolve into higher forms. Type M stars are so cool that they have a very small habitable zone, thus reducing the likelihood a planet would be in the right position.
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The moons of Jupiter supported the__________of the Universe over the Ptolemaic model
A) Newtonian model B) Galilean model C) Copernican model D) Kepler model
When light passes from a material with a high index of refraction into material with a low index of refraction:
a. none of the light is reflected. b. some light is reflected without a change of phase. c. some light is reflected with a 180° change of phase. d. the light that is not reflected has a 180° change of phase.
An electric generator transforms
A) chemical energy into electrical energy. B) electrical energy into mechanical energy. C) mechanical energy into electrical energy. D) direct current into alternating current. E) alternating current into direct current.
If a plane is flying at a speed so that the apex half-angle of its shockwave is 30°, what is its speed if the speed of sound is 320 m/s?
a. 960 m/s b. 640 m/s c. 320 m/s d. 160 m/s e. Choose this answer if a shock wave cannot form in this situation.