It was the Chinese who provided critical ancient data on supernovae and comets
Indicate whether the statement is true or false
TRUE
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Let the charge density in a certain region of space be ?. The electric field 
in that region points in the +x direction with 
= constant. This implies
A. that ? is positive in that region. B. that ? is negative in that region. C. that ? is zero in that region. D. that the field is physically impossible. E. nothing useful about the region’s charge density.
In the outer regions of the solar nebula where temperatures were low,
A) only rock and iron could condense B) only hydrogen compounds could condense as ices C) hydrogen and helium gases were able to condense D) in addition to rock and iron, hydrogen compounds also condensed as ices
A 35-mm single lens reflex (SLR) digital camera is using a lens of focal length 35.0 mm to photograph a person who is 1.80 m tall and located 3.60 m from the lens
(a) How far is the CCD sensor from the lens when the person is in focus? (b) How tall is the person's image on the CCD sensor?
Why is the sky blue?
a. Because it reflects the ocean. b. Because water droplets refract the light. c. Because blue light is scattered more than red light by atmospheric molecules. d. Because blue is the complementary color to the yellow Sun. e. Because dust particles in the air scatter different colors of light differently.