A particle of mass 200 ,g , is whirled into a vertical circle of radius 80 ,cm using a massless stri

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5.Work, Energy, Power and Collision

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A particle of mass $200 \,g$, is whirled into a vertical circle of radius $80 \,cm$ using a massless string. The speed of the particle when the string makes an angle of $60^{\circ}$ with the vertical line is $1.5 \,ms ^{-1}$. The tension in the string at this position is ........... $N$

A

$1$

B

$1.56$

C

$2$

D

$3$

Solution

(b)

$T-m g \cos \theta=\frac{m v^2}{R}$

$\theta=60^{\circ}$

Solving this

$T=1.56 \,N$

Standard 11

Physics

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