Answer:
8.4 m/s
Explanation:
The toy completes 10 circle in 30 seconds. So its frequency of revolution is
[tex]f=\frac{10}{30 s}=0.33 Hz[/tex]
The periof of revolution is the reciprocal of the frequency, so
[tex]T=\frac{1}{f}=\frac{1}{0.33 Hz}=3 s[/tex]
The radius of the circular path is
r = 4.0 m
So the total distance covered by the toy in one circle is the length of the circumference:
[tex]2\pi r[/tex]
And so the average speed is
[tex]v=\frac{2\pi r}{T}=\frac{2\pi (4.0 m)}{3 s}=8.4 m/s[/tex]
