Use the Figure to the Right to Answer the Next

Multiple Choice

Use the figure to the right to answer the next two problems. A ball of mass m = 100 g and radius r = 10 cm is suspended from a light spring with spring constant k = 4 N / m.The ball is then immersed in oil with viscosity = 0.2 Pa.s and driven at the resonant frequency by a variable force F = F₀ cos (t) at an amplitude of A = 10 cm.
-What is the value of F_o?

A) 0.12 N
B) 0.24 N
C) 0.056 N
D) 1.8 N
E) 0.67 N