The potential-energy graph of a harmonic oscillator is shown. Find the spring constant.

Question

G1 Physics · Accepted Answer

From the graph, U=0.04 J at displacement y=20 mm=0.020 m from equilibrium. Using U=(1/2)ky², k=2U/y²=0.08/(4×10⁻⁴)=200 N m⁻¹. Required answer: 200.