An SBc galaxy in the Hubble classification system would have...
A. a barred spiral shape with tight arms.
B. a spiral shape with tight arms.
C. a barred spiral shape with loose arms.
D. an elliptical shape with a medium elongation.
Ans: C. a barred spiral shape with loose arms.
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Which of the following best describes what would happen if a 1.5 solar mass neutron star, with a diameter of a few kilometers, were suddenly to appear in your hometown?
A) It would rapidly sink to the center of the Earth. B) It would crash into the Earth, throwing vast amounts of dust into the atmosphere which in turn would cool the Earth. Such a scenario is probably what caused the extinction of the dinosaurs. C) The combined mass of the Earth and the neutron star would cause the neutron star to collapse into a black hole. D) The entire mass of the Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. E) It would crash through the Earth, creating a large crater, and exit the Earth on the other side.
A layer of water (n = 1.333) floats on carbon tetrachloride (n = 1.461) contained in an aquarium. To the nearest degree, what is the critical angle at the interface between the two liquids?
a. 88° b. 78° c. 66° d. 58° e. 43°
Ypsilanti, Michigan, is located at latitude 42 degrees North. What is the altitude (above the southern horizon) of the Sun at solar noon on the summer solstice?
A. 132 degrees B. 108.5 degrees C. 71.5 degrees D. 42 degrees E. 23.5 degrees
The statement "Different samples of a pure compound always contain the same elements in the same proportion by mass" is known as the law of ______________
Fill in the blank(s) with correct word