Physics
Grade-10
Easy
Question
A boy moves a tied stone above his head in circles, time period of circular motion is 4.4 sec, and its speed of rotation is 42 m/s. What is the radius of the circle formed?
- 29.43 m
- 20.24 m
- 30.48 m
- 45.97 m
Hint:
Use formula, T = 
The correct answer is: 29.43 m
Time period, T = 4.4 s
Speed, v = 42 m/s
Radius, r = ?
According to formula,
T =
4.4 = 
Hence first option is correct.
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