A) 0.4 m, 1.5 Hz
B) 0.4 m, 0.5 Hz
C) 0.8 m, 0.5 Hz
D) 0.2 m, 0.5 Hz
Correct Answer: B
Solution :
The amplitude is the radius of the circle \[R=\frac{0.8}{2}m=0.4m.\] The frequency of the shadow are the same as that of the circular motion, so \[\omega =30rev/\min =0.5rev/s=\pi rad/s\] and\[v=\omega /2\pi =\pi /2\pi =0.5Hz\]
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