Question

A student ties a stone to a thread of length 1 m and starts swinging it in a circular motion. The stone completes 20 rotations in 10 s. Find the speed of the moving stone.
a) II mis
b) 21m's
C) 411 m's
d) 811 m/s​

Answer 1

Answer:

Let's consider it as uniform circular motion,

Given that,

Radius of the circular path = 1 m

Distance covered by the stone = ?

Number of rotations = 20

Time for completing 20 rotations = 10 seconds.

Since, the stone is moving in a circular path the distance covered by it is the circumference of the circle.

Circumference of the circle = 2πr

Circumference = 2×22/7×1m

Circumference = 44/7 m.

Total distance covered by the stone = 44/7×20 = 125.7 m

Total time = 10 seconds.

we know that,

Speed = Distance / Time

Speed = 125.7 m / 10 seconds

Speed = 12.57 m/sec.

Therefore, the speed of the stone is 12.57 m/sec

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Answer 2

Explanation:

Find the kuotient 684 divide 12 answer