Question

a stone of mass 1kg is tied with a string and it is whirled in a vertical circle of radius 1 m if the tension at the highest point is 14 Newton then velocity at lowest point will be..

Answer 1

Answer:

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Explanation:

Mass of the stone, m=1Kg

Radius, r=1m

Tension, T=14N

Let v

1

is velocity at the top point and v

2

is at the bottom point.

The tension at the top point is:

T=

r

mv

1

2

−mg

14=

1

1v

1

2

−1×10

v

1

2

=4

v

1

=2

So, total kinetic energy at the bottom is:

2

1

mv

2

2

=(mgh)

bottom

+

2

1

mv

1

2

2

1

mv

2

2

=20+2

2

1

mv

2

2

=22

v

2

=

44

=6.63m/s