The gravitational interaction was the first force figured out by scientist Sir Isaac Newton. However,
A. it is not a fundamental force of nature, only a symptom of inertia.
B. gravitation has been the hardest force to unite with electroweak and strong nuclear interactions.
C. until we can detect gravitational waves, it will remain a mystery.
D. it will never be incorporated into a "theory of everything" because it is an attractive force.
Answer: B
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Which of the following is not a strong argument for the theory that some large elliptical galaxies formed as the result of galaxy collisions?
A) Elliptical galaxies dominate the population in dense galaxy clusters. B) Some ellipticals have stars and gas that rotate opposite to the rest of the galaxy. C) Some elliptical galaxies are surrounded by shells of stars. D) Computer simulations predict that the product of a galaxy collision is generally an elliptical galaxy. E) Galaxy collisions are common and most galaxies in the universe are elliptical.
Again consider two twin sisters, Gwen and Jackie, who are both 20 years old in the year 2020. This time, assume that Jackie makes the round-trip to Vega, which is 25 light-years away, at an average speed of 0.9999c
Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.) A) It's the year 2070. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. B) It's the year 2070 and both twin sisters are 70 years old. C) It's the year 2070. Gwen is 70 years old. Jackie is 19. D) According to Gwen, Jackie returns to Earth in the year 2070, but according to Jackie, she returns in the year 2021.
An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 40.0° with the normal, what is the angle of the refracted ray in the water?
a. 37.0° c. 24.2° b. 26.8° d. 28.8°
Most coal deposits were formed in the
A) Cenozoic era. B) Mesozoic era. C) Paleozoic era. D) Precambrian era.