Question

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Answer 1

Explanation:

Tension in the string at lowest point is 3mg

Explanation:

Length of the pendulum = l

Mass of the bob = m

Let the velocity at the lowest position is v

The bob is released from the horizontal position then its potential energy will be converted into kinetic energy at the lowest position

mgl= 1/2 mv^2

⟹v^2 =2gl

the centrifugal acceleration at the lowest point

=m (V^2/l)

= m(2gl /l)

=2mg

The tension in the string at the lowest point

= Weight of the bob + Tension due to centrifugal force

=mg+2mg

=3mg

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