The cosmological principle calls for the distribution of galaxies to be homogeneous. On the large scale, is this true?
What will be an ideal response?
No; the superclusters of galaxies seem to form sheets and walls, with a frothy appearance on the grandest of scales. There are also huge, apparently empty voids between the superclusters of galaxies; the explanation of this inconsistency is still unknown.
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Total Internal Reflection: A ray of light in glass strikes a water-glass interface at an angle of incidence equal to one-half the critical angle for that interface. The index of refraction for water is 1.33, and for the glass it is 1.43. What angle does the refracted ray in the water make with the normal?
A. 37° B. 42° C. 47° D. 32° E. 27°
The best site for placing an X-ray telescope is ________.
A. a valley B. above Earth's atmosphere C. a desert D. near an ocean E. a mountaintop
A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000 m
What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 6220 m/s B) 2580 m/s C) 3110 m/s D) 2840 m/s E) 7440 m/s
A spatially uniform magnetic field cannot exert a magnetic force on a particle in which of the following circumstances? There may be more than one correct statement
1.The particle is charged. 2.The particle moves perpendicular to the magnetic field. 3.The particle moves parallel to the magnetic field. 4.The magnitude of the magnetic field changes with time. 5.The particle is at rest.