A farsighted person cannot see clearly closer than 2.0 m. What power contact lenses would correct this near point to 25 cm?
A. 2.0 D
B. 0.5 D
C. -0.5 D
D. 3.5 D
E. -3.5 D
D. 3.5 D
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When a light ray travels between any two points, the path it takes is the one that (Hint: Eliminate answers you know are wrong.)
a. covers the greatest distance. b. follows the greatest index of refraction. c. avoids travel in more than one medium. d. is the mean between the longest and the shortest paths. e. takes the least time.
The satellite Amalthea orbits Jupiter at just about the same distance in kilometers at which Mimas orbits Saturn. Yet Mimas takes almost twice as long to orbit
What can you deduce from this difference qualitatively? Since Jupiter and Saturn are not very different in radius, what else can you conclude?
Supermassive black holes have weaker gravity than stellar-mass black holes, producing slower spins for the infalling matter
a. True b. False Indicate whether the statement is true or false
A proposed explanation for gamma-ray bursters is
A) hypernova-making black holes and bipolar jets. B) coalescence of a neutron star binary. C) collisions between two white dwarfs. D) Both A and B are possible. E) All three are possible.