Thin Lenses: A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A. 14 mm
B. 8.7 mm
C. 1.4 mm
D. 1.1 mm
Answer: D
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What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
The SI unit of mass, the kilogram, is currently defined
A) as 10-22 the mass of the Earth's moon. B) as 10-24 the mass of the Earth. C) by the President's weight. D) by a prototype platinum-iridium cylinder kept at the International Bureau of Weights and Measures in Sevres, France. E) the mass of 5.9786332 × 1026 protons.
How does the escape speed from Mars compare with that of the Earth? [ MEarth=9.31? MMars; REarth=1.88 ? RMars]
A) 222.% B) 22.5% C) 44.9% D) 66.2% E) 20.2%
Hubble divided the spirals into normal and ________ categories
Fill in the blank(s) with correct word