Question

A stone is swinging in a horizontal circle 0.8 m in diameter at 30 rev / min. A distant horizontal light beamcauses a shadow of the stone to be formed on a nearly vertical wall. The amplitude and period of thesimple harmonic motion for the shadow of the stone are

• A. 0.4 m, 4 s
• B. 0.2 m. 2 s
• C. 0.4 m, 2 s
• D. 0.8 m, 2 s

Answer 1

The correct option is C 0.4 m, 2 s

$Amplitude=\frac{0.80}{2}=0.4m$

$Period=\frac{1}{f}=\frac{1}{\frac{30}{60}}=2s$