Couple - class-XI
Description: couple | |
Number of Questions: 24 | |
Created by: Darshan Khurana | |
Tags: physics force rotational motion of a rigid body and moment of inertia motion of system of particles and rigid bodies turning effects of forces systems of particles and rotational motion turning on a pivot forces - vectors and moments |
Which of the following is/are the properties of moment of a couple?
Two like parallel forces $20\ N$ and $30\ N$ act at the ends $A$ and $B$ of a rod $1.5\ m$ long. The resultant of the forces will act at the point:
Two small kids weighing 10kg and 15kg are trying to balance a seesaw of total length 5m with the fulcrum at the centre. If one of the kids is sitting at an end, the other should sit at
A couple produces
A couple is acting on a two particle systems. The resultant motion will be
A couple can never be replaced by a single force.
A couple produces,_____
In case of torque of a couple, if the axis is changed by displacing it parallel to itself, torque will
A couple produces :
While opening a tap with two fingers, the forces applied by the fingers are:
$ML^2T^{-2}$ is the dimensional formula for
An automobile engine develops $100$ $kW$ when rotating at a speed of $1800\ rev/min$. The torque it delivers is
Two small kids weighing 10 kg and 15 kg are trying to balance a seesaw of total length 5m, with the fulcrum at the centre. If one of the kids is sitting at an end, where should the other sit?
If principle of moments for any object holds, then object is in state of
A uniform dice of mass $10kg$ radius $1m$ is placed on a rought horizontal surface. The coefficient of friction between the disc and the surface is $0.2$. A horizontal time varying force is applied on the centre of the disc whose variation with time is shown in graph.
List-I List-IIDisc rolls without slipping at $t=7s$Disc rolls with slipping at $t=3s$ Disc starts slipping at at $t=4s$Friction force is $10N$ at None
When slightly different weights are placed on the two pans of a beam balance, the beam comes to rest at an angle with the horizontal. The beam is supported at a single point P by a pivot. Then which of the following statement(s) is/are true ?
When a ceiling fan is switched off, its angular velocity reduces by $50$% while it makes $36$ rotations. How many more rotations will it make before coming to rest? (Assume uniforms angular retardation)
The minimum value of ${ \omega } _{ 0 }$ below which the ring will drop down is
a flywheel is in the form of a solid circular wheel of mass 72 kg and radius 50cm and it makes 70 r.p.m. then the energy of revolution is:
Two discs having masses in the ratio $1:2$ and radii in the ratio $1:8$ roll down without slipping one by one from an inclined plane of height $h$. The ratio of their linear velocities on reaching the ground is