Most stars generate their energy by the thermonuclear fusion of ____________________ to form ____________________
Fill in the blank(s) with correct word
hydrogen; helium
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Unpolarized light of intensity 
is sent through 4 polarizers, each of the last three rotated 30
from the previous polarizer so that the last polarizer is perpendicular to the first. What is the intensity transmitted by this system?
A. 0.75 
B. 0.50
C. 0.42
D. 0.21
E. 0
A runner starts from rest and with an acceleration of 1.0 
travels a distance of 10 meters. The time it takes the runner to cover the distance is
A. 6.3 s. B. 5.7 s. C. 5.0 s. D. 4.5 s. E. 3.8 s.
What happens during the apparent retrograde motion of a planet?
a) The planet appears to move westward with respect to the stars over a period of many nights b) the planet moves backward through the sky over the course of a night c)the planet moves through constellations that are not part of the zodiac
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.20 m/s?
a. 3.0 rev/s c. 0.48 rev/s b. 1.5 rev/s d. 0.64 rev/s