The concept of the epicycle was introduced in the heliocentric model to explain the retrograde motion of the planets.
Answer the following statement true (T) or false (F)
False
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In stellar astronomy, _____ states that the weight on each layer of a star is balanced by the pressure in that layer
A) the law of conservation of mass B) the law of conservation of energy C) the law of hydrostatic equilibrium D) the law of energy transport
Polaroid sunglasses help when skiing on snow on a sunny day by reducing the sunlight from the snow. This light from the snow has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.
Air pollution results from ______________ combustion of ______________ fuels
Fill in the blank(s) with correct word
Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
, having magnitudes 12.0 m, 10.0 m, 8.0 m, and 4.0 m, respectively. The sum of these four vectors is 
A. 16.4 m at an angle 77.8° with respect to +x-axis. B. 16.4 m at an angle 12.3° with respect to +x-axis. C. 19.5 m at an angle 77.8° with respect to +x-axis. D. 19.5 m at an angle 12.3° with respect to +x-axis. E. 8.20 m at an angle 77.8° with respect to +x-axis.