Question

A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec if the radius of the circle is 1.2m then tension in the string when the body is at the top of circle

Answer 1

Answer:

then tension in the string when the body is at the top of circle a body of mass 0.4 kg is whirled in a vertical circle is 1,2 m then tension in the string when the body.

Answer 2

The tension in the string when the body is at the top of circle is 71.87 N.

Explanation:

It is given that,

Mass of a body, m = 0.4 kg

Radius of the circle, r = 1.2 m

Angular velocity of the body, $\omega=2\ rev/s=12.5664\ rad/s$

The tension in the string when the body is at the top of the circle is given by the following formula as :

$T=\dfrac{mv^2}{r}-mg$

Since, $v=r\omega$

$T=m\omega^2r-mg$

$T=0.4\times (12.5664)^2\times 1.2-0.4\times 9.8$

T = 71.87 N

So, the tension in the string when the body is at the top of circle is 71.87 N. Hence, this is the required solution.

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