MHT CET 2019 3rd May Morning Shift | Circular Motion Question 71 | Physics

A mass is whirled in a circular path with constant angular velocity and its linear velocity is $v$. If the string is now halved keeping the angular momentum same, the linear velocity is

$2 v$

$\frac{v}{2}$

$v$

$v \sqrt{2}$

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

A body of mass $m$ is performing a UCM in a circle of radius $r$ with speed $v$. The work done by the centripetal force in moving it through $\left(\frac{2}{3}\right) \mathrm{rd}$ of the circular path is

zero

$m v^2 \pi r$

$\frac{2 \pi m v^2 r}{3}$

$\frac{2 m v^2 \pi}{3}$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

In U.C.M., when time interval $\delta t \rightarrow 0$, the angle between change in velocity ( $\delta \mathbf{v}$ ) and linear velocity $(\boldsymbol{v})$ will be

$0^\circ$

$90^\circ$

$180^\circ$

$45^\circ$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A particle is performing U.C.M. along the circumference of a circle of diameter 50 cm with frequency 2 Hz . The acceleration of the particle in $\mathrm{m} / \mathrm{s}^2$ is

$2 \pi^2$

$8 \pi^2$

$\pi^2$

$4 \pi^2$

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