When a ceiling fan is switched on, it makes 10 rotations in first 3,seconds, How many rotations will

English

Gujarati

Hindi

3-2.Motion in Plane

normal

When a ceiling fan is switched on, it makes $10$ rotations in first $3\,seconds,$ How many rotations will it make in the next $3\,seconds.$ (Assume uniform angular acceleration)

A$10$

B$20$

C$30$

D$40$

Solution

For constant acceleration
$n_1 : n_2 : n_3 ….. = 1 : 3 : 5 : \,………..$
$\therefore $ if $n_1 = 10$ rotation then $n_2 = 30$ rotation

Standard 11

Physics

Share

Similar Questions

A particle is moving on a circular path of radius $r$ with uniform velocity $v$. The change in velocity when the particle moves from $P$ to $Q$ is $(\angle POQ = {40^o})$

normal

A particle does uniform circular motion in a horizontal plane. The radius of the circle is $20$ cm. The centripetal force acting on the particle is $10\, N$. It's kinetic energy is …….. $J$

normal

A point $P$ moves in counter clock wise direction on a circular path as shown in figure. The movement of $'P'$ is such that it sweeps out a length $S = t^3 + 5$, where $'S'$ is in meter and $t$ is in seconds. The radius of the path is $20\, m$. The acceleration of $'P'$ when $t = 2\, sec$. is nearly ……… $m/s^2$

normal

A steam boat goes across a lake and comes back : $(i)$ on a quiet day when the water is still and $(ii)$ on a rough day when there is a uniform current so as to help the journey onward and to impede the journey back. If the speed of the launch, on both days, was same, the time required for the complete journey on the rough day as compared to that on the quiet day, will be

normal

A particle is moving eastwards with velocity of $5\,m/s$. In $10 \,sec$ the velocity changes to $5 \,m/s$ northwards. The average acceleration in this time is

normal