Chapter 9 – Rotational Dynamics
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 9 - Rotational Dynamics
A solid cylinder of mass 3kg is placed on a rough inclined plane of inclination 30^∘. If g=10ms^2, then the minimum frictional force required for it to roll without slipping down the plane is
27
Nov
A solid cylinder of mass 3kg is placed on a rough inclined plane of inclination 30^∘. If g=10ms^2, then the minimum frictional force required for it to roll without slipping down the plane is A solid cylinder of mass 3kg is placed on a rough inclined plane of inclination 30^∘. If g=10ms^2 then the minimum [...]
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/s about a vertical axis through the centre of the platform and straight up through the boy. He holds 2kg masses in each of his hands close to his body. The combined moment of inertia of the system is 1kgm^2 . The boy now stretches his arms so as to hold the masses far from his body. In this situation, the moment of inertia of the system increases to 2kgm^2 . The kinetic energy of the system in the latter case as compared with that in the previous case will
27
Nov
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/s about a vertical axis through the centre of the platform and straight up through the boy. He holds 2kg masses in each of his hands close to his body. The combined moment of inertia of [...]
Two discs, each having moment of inertia 5kgm^2. about its central axis, rotating with speeds 10rads^−1 and 20rads^−1, are brought in contact face to face with their axes of rotation coincided. The loss of kinetic energy in the process is
27
Nov
Two discs, each having moment of inertia 5kgm^2. about its central axis, rotating with speeds 10rads^−1 and 20rads^−1, are brought in contact face to face with their axes of rotation coincided. The loss of kinetic energy in the process is are brought in contact face to face with their axes of rotation coincided. The loss [...]
Two rigid bodies A and B rotate with angular momenta LA and LB respectively. The moments of inertia of A and B about the axes of rotation are IA and IB respectively. If IA = IB /4 and LA = 5LB . Then the ratio of rotational kinetic energy KA of A to the rotational energy KB of B is given by
27
Nov
Two rigid bodies A and B rotate with angular momenta LA and LB respectively. The moments of inertia of A and B about the axes of rotation are IA and IB respectively. If IA = IB /4 and LA = 5LB . Then the ratio of rotational kinetic energy KA of A to the [...]
A solid sphere rolls down two different inclined planes of the same height but of different inclinations
27
Nov
A solid sphere rolls down two different inclined planes of the same height but of different inclinations A solid sphere rolls down two different inclined planes of the same height but of different inclinations November 27, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 9 - Rotational Dynamics ,
The rolling object rolls without slipping down an inclined plane (angle of inclination θ), then the minimum acceleration it can have is :
27
Nov
The rolling object rolls without slipping down an inclined plane (angle of inclination θ), then the minimum acceleration it can have is : The rolling object rolls without slipping down an inclined plane (angle of inclination θ) then the minimum acceleration it can have is : November 27, 2020 Category: Cengage JEE Mains Physics by [...]
In the figure shown, a ball without sliding on a horizontal surface. It ascends a curved track up to a height h and returns. The value of h is h1 for sufficiently rough curved track to avoid sliding and is h2 for smooth curved track, then.
27
Nov
In the figure shown, a ball without sliding on a horizontal surface. It ascends a curved track up to a height h and returns. The value of h is h1 for sufficiently rough curved track to avoid sliding and is h2 for smooth curved track, then. In the figure shown then the initial angular acceleration [...]
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In the figure shown ,
then the initial angular acceleration of the board is: (Neglect weight of board) ,
thereby destroying balance ,
Three children are sitting on a see-saw in such a way that it is balanced. A 20kg and a 30kg boy are on opposite sides at a distance of 2m from the pivot. If the third boy jumps off ,
A smooth tube of certain mass is rotated in a gravity-free Space and released. The two balls shown in Fig move towards the ends of the tube. For the whole system, which of the following quantities is not conserved.
27
Nov
A smooth tube of certain mass is rotated in a gravity-free Space and released. The two balls shown in Fig move towards the ends of the tube. For the whole system, which of the following quantities is not conserved. A smooth tube of certain mass is rotated in a gravity-free Space and released. The two [...]
A block of mass m is attached to a pulley disc of equal mass m, radius r by means of a slack string as shown. The pulley is hinged about its centre on a horizontal table and the block is projected with an initial velocity of 5m/s. Find the velocity when the string becomes taut.
27
Nov
A block of mass m is attached to a pulley disc of equal mass m, radius r by means of a slack string as shown. The pulley is hinged about its centre on a horizontal table and the block is projected with an initial velocity of 5m/s. Find the velocity when the string becomes taut. [...]
Tags:
A block of mass m is attached to a pulley disc of equal mass m ,
then the initial angular acceleration of the board is: (Neglect weight of board) ,
thereby destroying balance ,
Three children are sitting on a see-saw in such a way that it is balanced. A 20kg and a 30kg boy are on opposite sides at a distance of 2m from the pivot. If the third boy jumps off ,
A small bead of mass m moving with velocity v gets threaded on a stationary semicircular ring of mass m and radius R kept on a horizontal table. The ring can freely rotate about its centre. The bead comes to rest relative to the ring. What will be the final angular velocity of the system?
27
Nov
A small bead of mass m moving with velocity v gets threaded on a stationary semicircular ring of mass m and radius R kept on a horizontal table. The ring can freely rotate about its centre. The bead comes to rest relative to the ring. What will be the final angular velocity of the system? [...]
Tags:
then the initial angular acceleration of the board is: (Neglect weight of board) ,
thereby destroying balance ,
Three children are sitting on a see-saw in such a way that it is balanced. A 20kg and a 30kg boy are on opposite sides at a distance of 2m from the pivot. If the third boy jumps off ,