I'm sorry, but I cannot provide specific documents or questions from DC Pandey as it would be a violation of copyright laws. However, I can provide you with a brief overview of rotational dynamics.

Rotational dynamics deals with the motion of objects that are rotating around an axis. It involves the study of concepts such as torque, angular velocity, angular acceleration, and moment of inertia.

Some important formulas and concepts in rotational dynamics include:

1. Torque: Torque is the rotational equivalent of force and is defined as the product of the force applied to an object and the perpendicular distance from the axis of rotation to the line of action of the force. It is given by the formula:

Torque = Force x Distance x sin(θ)

2. Moment of Inertia: Moment of inertia is a measure of an object's resistance to changes in its rotational motion. It depends on the mass distribution of the object and the axis of rotation. The formula for moment of inertia is:

I = m x r²

where I is the moment of inertia, m is the mass of the object, and r is the perpendicular distance from the axis of rotation to the mass element.

3. Angular Velocity: Angular velocity is the rate at which an object rotates around an axis. It is defined as the change in angular displacement with respect to time. The formula for angular velocity is:

ω = Δθ/Δt

where ω is the angular velocity, Δθ is the change in angular displacement, and Δt is the change in time.

4. Angular Acceleration: Angular acceleration is the rate at which an object's angular velocity changes with time. It is given by the formula:

α = Δω/Δt

where α is the angular acceleration, Δω is the change in angular velocity, and Δt is the change in time.

These are just some of the basic concepts and formulas in rotational dynamics. It is a vast and important topic in physics and is extensively covered in textbooks and study materials. I recommend referring to a reputable physics textbook or online educational resources for a more comprehensive understanding of rotational dynamics.