A particularly large playground merry-go-round is essentially a uniform solid disk of mass 3M and radius R that can rotate with no friction about a central axis. You, with a mass M, are a distance of R/2 from the center of the merry-go-round, rotating together with it at an angular velocity of 2.20 rad/s clockwise (when viewed from above). You then move to the outside of the merry-go-round so you are a distance R from the center, still rotating with the merry-go-round. Consider you and the merry-go-round to be one system. (a) When you reach the outer edge of the merry-go-round, what is the angular velocity of the you and merry-go-round system? rad/s (b) You then start running around the outer edge of the merry-go-round. At what angular speed would you have to run to make the merry-go-round alone come to a complete stop? rad/s
Angular Momentum
The momentum of an object is given by multiplying its mass and velocity. Momentum is a property of any object that moves with mass. The only difference between angular momentum and linear momentum is that angular momentum deals with moving or spinning objects. A moving particle's linear momentum can be thought of as a measure of its linear motion. The force is proportional to the rate of change of linear momentum. Angular momentum is always directly proportional to mass. In rotational motion, the concept of angular momentum is often used. Since it is a conserved quantity—the total angular momentum of a closed system remains constant—it is a significant quantity in physics. To understand the concept of angular momentum first we need to understand a rigid body and its movement, a position vector that is used to specify the position of particles in space. A rigid body possesses motion it may be linear or rotational. Rotational motion plays important role in angular momentum.
Moment of a Force
The idea of moments is an important concept in physics. It arises from the fact that distance often plays an important part in the interaction of, or in determining the impact of forces on bodies. Moments are often described by their order [first, second, or higher order] based on the power to which the distance has to be raised to understand the phenomenon. Of particular note are the second-order moment of mass (Moment of Inertia) and moments of force.
![**Educational Content: Physics Problem on Rotational Motion**
**Problem Statement:**
A particularly large playground merry-go-round is essentially a uniform solid disk of mass \(3M\) and radius \(R\) that can rotate with no friction about a central axis. You, with a mass \(M\), are at a distance of \(R/2\) from the center of the merry-go-round, rotating together with it at an angular velocity of \(2.20 \, \text{rad/s}\) clockwise (when viewed from above). You then move to the outside of the merry-go-round so you are a distance \(R\) from the center, still rotating with the merry-go-round. Consider you and the merry-go-round to be one system.
**Questions:**
(a) When you reach the outer edge of the merry-go-round, what is the angular velocity of you and the merry-go-round system?
\[ \boxed{\text{rad/s}} \]
(b) You then start running around the outer edge of the merry-go-round. At what angular speed would you have to run to make the merry-go-round alone come to a complete stop?
\[ \boxed{\text{rad/s}} \]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5ea9d1b2-8f99-46bf-8a92-8bbfd1b1e697%2F65eb481f-3647-4652-8f15-c0d981095616%2F1vjfv9i_processed.png&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
