- #1

timetraveller123

- 621

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1. Homework Statement

1. Homework Statement

i was solving the 2008 semi final us physics olympiad paper when i got stuck on question B2 in part 2

http://www.aapt.org/Programs/contests/upload/olympiad_2008_semi-final_soln.pdf

the link takes you a pdf with questions and solution however i don't understand the soution to B2 i get part ai) but not part aii) how do you prove the motion is simple harmonic and i am not sure how they derive the period in that way

## Homework Equations

T = 2π/ω

f = q E

V = Ed

f = mg

sin θ ≈ tan θ ≈ θ

## The Attempt at a Solution

i tried to turn the coordinate system such that the equilibrium is in a vertical position but failed miserably i also tried taking a force approach and also failed i have no idea how to start please help