Ptolemy formulated a(n) ____________________ model of the solar system to predict positions of the Sun, Moon, and planets
Fill in the blank(s) with correct word
geocentric
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An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
A. 0.12 ?s B. 1.2 ms C. 0.18 ?s D. 1.8 ms E. 1.8 ?s
Which of the following phenomena is not commonly associated with the star formation process?
A) strong winds of particles blowing out into space from a protostar B) powerful "jets" shooting out along the rotation axis of a protostar C) the formation of a spinning disk of material around a protostar D) intense ultraviolet radiation coming from a protostar
A Doppler red shift indicates
a. a shift toward higher frequencies. b. a shift toward shorter wavelengths. c. that a light source is receding relative to the observer. d. none of these.
An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror. How far is the object from the mirror?
A) 124 cm B) 47.6 cm C) 18.2 cm D) 12.0 cm