Overall, current data suggest that ________ of stars are orbited by one or more planets.
A) at least about 70%
B) approximately 1%
C) approximately 20%
D) no more than 30%
A) at least about 70%
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A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m, and its amplitude is 8.4 mm
How much time does it take for a crest of the transverse wave to travel the length of the wire? A) 36 ms B) 31 ms C) 40 ms D) 44 ms E) 49 ms
When the Moon appears on an observer's meridian at 4 A.M., the Moon is in the ______________ phase
Fill in the blank(s) with correct word
Suppose it were possible to drill a frictionless cylindrical channel along a diameter of the Earth from one side of the Earth to another. A body dropped into such a channel will only feel the gravitational pull of mass within a sphere of radius equal to the distance of the mass from the center of the Earth. The density of the Earth is 5.52 × 10^3 kg/m3 and G = 6.67 × 10^?11 N/m2/kg2 . The
mass will oscillate with a period of a. 84.4 min. b. 169 min. c. 24.0 h. d. 1 130 h. e. 27.2 d.
What was Eratosthenes's mathematical contribution to the history of astronomy, even though it was incorrect? a. He calculated the diameter of Earth by what he learned from travelers' itineraries
b. He estimated Earth's revolution rate by measuring the length of shadows casted on the surface. c. He determined that all the planets orbited Earth every 24 hrs. d. He attempted to calculate Earth's radius by utilizing the position of sunlight. e. He believed all of nature was underlain by musical principles.