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http://hyperphysics.phy-astr.gsu.edu/hbase/shm.html
http://www.animations.physics.unsw.edu.au/mechanics/chapter4_simpleharmo...
http://www.britannica.com/EBchecked/topic/545322/simple-harmonic-motion
http://www.sparknotes.com/physics/oscillations/oscillationsandsimpleharm...
http://www.sparknotes.com/physics/oscillations/oscillationsandsimpleharm...
http://www.kwantlen.ca/science/physics/faculty/mcoombes/P1120_Solutions/...
http://www.newhavenscience.org/physics/answershoproblems.htm
http://physics.doane.edu/hpp/Resources/Fuller3/pdf/F3Chapter_15.pdf
http://slxy.cqupt.edu.cn/admin/upload/teachermounts/1289961141.pdf
http://www.d.umn.edu/~rlindek1/me3230/Ch%208_Waldren.pdf
http://academic.udayton.edu/LenoPedrotti/examples/206Springs.pdf
http://web.mit.edu/8.01t/www/materials/ProblemSets/Raw/f12/ps11sol.pdf
http://web.mit.edu/8.01t/www/materials/modules/chapter23.pdf
