MCQ
The angular speed of seconds needle in a mechanical watch is
  • $\frac{\pi }{{30}}\,rad/s$
  • B
    $2\pi \,rad/s$
  • C
    $\pi \,rad/s$
  • D
    $\frac{{60}}{\pi }\,rad/s$

Answer

Correct option: A.
$\frac{\pi }{{30}}\,rad/s$
a
(a)$\omega = \frac{{2\pi }}{T} = \frac{{2\pi }}{{60}} = \frac{\pi }{{30}}\,rad/s$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

When a mass $M$ is attached to the spring of force constant $k$, then the spring stretches by $l$. If the mass oscillates with amplitude $l$, what will be maximum potential energy stored in the spring
A particle moves in a plane with constant acceleration in a direction different from the initial velocity. The path of the particle will be
A cricketer hits a ball with a velocity $25\,\,m/s$ at ${60^o}$ above the horizontal. How far above the ground it passes over a fielder $50 m$ from the bat  ........ $m$ (assume the ball is struck very close to the ground)
A hole is drilled in a metal sheet. At $27^{\circ}\,C$, the diameter of hole is $5\,cm$. When the sheet is heated to $177^{\circ}\,C$, the change in the diameter of hole is $d \times$ $10^{-3}\,cm$. The value of $d$ will be $...........$ if coefficient of linear expansion of the metal is $1.6 \times$ $10^{-5} /{ }^{\circ}\,C$
Which of the following is a one dimensional motion
An object performs action due to force acting towards a point. The mgnitude of force is inversely proportional to the square of the distance. The path of the object will be:
A body of mass m having an initial velocity $v$, makes head on collision with a stationary body of mass $M$. After the collision, the body of mass $m$ comes to rest and only the body having mass $M$ moves. This will happen only when
A string is stretched between fixed points separated by $75.0\,\, cm.$ It is observed to have resonant frequencies of $420\,\, Hz$ and $315\,\, Hz$. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is .... $Hz$
The displacement $x$ of a particle in a straight line motion is given by $x=1-t-t^2$. The correct representation of the motion is $..............$.
A body is in pure rotation. The linear speed $v$​ of a particle, the distance $r$ of the particle from the axis and angular velocity $\omega $ of the body are related as $\omega  = \frac{v}{r}$, thus