A body of mass m, kg is rotating in a vertical circle at end of a string of length r metre. differen

English

Gujarati

Hindi

3-2.Motion in Plane

normal

A body of mass $m\, kg$ is rotating in a vertical circle at the end of a string of length $r$ metre. The difference in the kinetic energy at the top and the bottom of the circle is

A

$\frac{{mg}}{r}$

B

$\frac{{2mg}}{r}$

C

$2mgr$

D

$mgr$

Solution

(c) Difference in $K.E.$ = Difference in $P.E.$ = $2mgr$

Standard 11

Physics

Share

Similar Questions

A particle of mass $m$ is projected with a velocity $V$ making an angle of $45^o$ with the horizontal. The magnitude of the angular momentum of the projectile about the point of projection when the particle is at its maximum height $h$ is

normal

Consider a point $P$ on the circumference of a disc rolling along a horizontal surface. If $R$ is the radius of the disc, the distance through which $P$ moves in one full rotation of the disc is

normal

In projectile motion, the modulus of rate of change of velocity

normal

An aircraft executes a horizontal loop with a speed of $150 \,m/s$ with its, wings banked at an angle of ${12^o }$. The radius of the loop is ………. $km$. $(g = 10\,\,m/{s^2})$

normal

A body of mass $m$ is suspended from a string of length $l$. What is minimum horizontal velocity that should be given to the body in its lowest position so that it may complete one full revolution in the vertical plane with the point of suspension as the centre of the circle

normal