A hyperopic eye can focus on objects which are 75. cm and farther. What POWER and what FOCAL LENGTH spectacles should be prescribed so it can see objects 25. cm and farther from the eye? (Assume negligible distance between spectacles and eye.)
What will be an ideal response?
POWER = 2.7 Diopters; f = 38. cm
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Kepler used Tycho's observations to show that the planets
a. followed perfectly circular orbits. b. followed perfectly cubical orbits. c. all circled the Earth. d. followed elliptical orbits.
Astronomers believe that Pluto was pulled into the Solar System by Neptune. The hypothesis is supported by the fact that Pluto and Neptune have a 3:2 orbital period ratio.
Answer the following statement true (T) or false (F)
Compare the days, seasons, and years of Mars and Earth
What will be an ideal response?
According to the consensus among those scientists who have studied the question, what is the scientific status of the notion that Earth is now or was in the past visited by extraterrestrial life?
A) Although extraterrestrial life is theoretically plausible, and there is observational evidence for it, most scientists still will not accept the conclusion that we have been visited because it seems too unconventional or "kooky." B) Extraterrestrial life is theoretically plausible, and there is real observational evidence for it, which is why most scientists believe that we have been visited. C) Although there is no real evidence that Earth has been visited by extraterrestrials, extraterrestrial life is theoretically plausible. D) Extraterrestrial life is implausible on general theoretical grounds, and there is no real evidence that Earth has been visited by extraterrestrials. E) Although extraterrestrial life is implausible on general theoretical grounds, there is observational evidence for it.