As a star begin to form the initial energy source is from
a. nuclear fusion.
b. nuclear fission.
c. gravitational potential energy.
d. magnetic fields.
c
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A ray of light passes from glass into a liquid, as shown in the figure. What is the speed of the light in the liquid? (c = 3.00 × 108 m/s)
What will be an ideal response?
Spring tides occur
a. at new Moon and first-quarter Moon. b. at first quarter and third-quarter Moons. c. at new Moon and full Moon. d. at third-quarter and full Moons. e. at noon and midnight.
What is the direction of 
at point P?
A. A B. B C. C D. D E. E F. F T. Zero
Recent evidence from very distant supernova explosions indicates that the universe is expanding
A) at a decreasing rate, and this will eventually turn into an overall contraction. B) at a decreasing rate, but without ever coming to a halt (so that it will expand forever). C) at a decreasing rate, and this will eventually come to a halt with no further expansion or contraction. D) at an unchanging rate. E) at an increasing rate.