The ________ equation was written to assess the probabilities of technological, intelligent life existing in the Galaxy
Fill in the blank(s) with correct word
Drake
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Eratosthenes used simple geometry to determine the distance between Alexandria to Syene so that he could calculate Earth's_______________
Fill in the blank(s) with correct word
What is the evidence for an accelerating universe?
A) White-dwarf supernovae are the same brightness regardless of redshift. B) White-dwarf supernovae are slightly brighter than expected for a coasting universe. C) White-dwarf supernovae are slightly dimmer than expected for a coasting universe. D) The Andromeda Galaxy is moving away from the Milky Way at an ever-increasing speed. E) There is far more dark matter than visible matter in the universe.
A 0.5 kg fish, hooked as shown below, starts to swim away at a speed of 3 m/s. The angular momentum of the fish relative to the hand holding the fishing rod is about
A.
.B.
.C.
.D.
.E.
.A gray (Gy) is
A) 3.70 × 1010 decays/s in radium. B) the SI unit of absorbed dose = 1 J/kg = 100 rad. C) a dosage of 2.58 × 10-4 C/kg. D) the SI unit of radioactivity (= 1 decay/s). E) 10-2 J/kg.