A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 sin (?t + ?/3). The velocity (in m/s) of the body at t = 1.0 s is
A. +7.9.
B. ?7.9.
C. ?14.
D. +14.
E. ?5.0.
Answer: B
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The Almagest
a. is the book that first described the heliocentric solar system. b. is a collection of the science and mathematics of the Greeks. c. caused the author to be sentenced to house arrest. d. is a book of astrological myths and predictions produced by the Arabs. e. first described the Copernican theory.
Geologic evidence places Earth's age at ______________ million years
Fill in the blank(s) with correct word
Which force has the smallest magnitude?
A. 
B. 
C. Both and (which are equal)
D.
E. 
Which of the following critical features of the heliocentric model leads to Venus exhibiting a full range of phases?
A) When Venus is closer to the Sun, it moves faster. B) Venus passes on the far-side of the sun from the Earth's perspective. C) Venus physically distorts from a sphere as it orbits the sun.