1. The problem statement, all variables and given/known data The 900-mg balance wheel of a certain clock is made up of a thin metal ring of radius 12 mm connected by spokes of negligible mass to a fine suspension fiber as in (Figure 1) . The back-and-forth twisting of the fiber causes the wheel to move in simple harmonic motion with period T. The clock ticks four times each second, with the interval between ticks equal to T/2. 2. Relevant equations I am not so sure how to approach this. 3. The attempt at a solution I tried to find T. Since each seconds has four ticks and the time span between two is T/2, thus I inferred that 1 second = 3T/2 or T = 2/3 Second. I know the formula for find K is T = 2*pi*sqrt (I/K), but I kept getting the wrong answer. Please help me out.