Angular velocity with time varying moment

In summary, the conversation discussed a problem involving angular velocity and unknown variables such as moment of inertia, angular acceleration, and torque. The person seeking help was unsure of where to start, but was given two clues and eventually understood how to solve the problem by integrating the momentum equation and multiplying by 1/Inertia. The thread title was also changed to meet the requirements of the forum.
  • #1
SteliosVas
70
0
Hi there,

I have been given this question, and I have not even the slightest of clue's where to start.

I know angular velocity is equal to ω=v/r

But besides that I have no idea.

Where can I start?
 

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  • #2
How is it that you have been given a problem that you have no clue how to solve? Is this for a class?
 
  • #3
Have you studied the terms 'moment of inertia', 'angular acceleration', or 'torque' yet?
 
  • #4
Here are two clues:
1) You don't need mb.
2) You need to perform an integration.
 
  • #5
Please note that I have changed the thread title to make it more descriptive of the subject matter. This is a requirement for the Homework sections of Physics Forums. The thread was moved here (because it is a homework type question) from a section where thread title requirements are not so stringent.

-- gneill, PF Mentor
 
  • #6
Ah right I got you guys, thanks for the help. It didn't click to me initially that if i integrate the momentum equation and multiply by 1/Inertia I should get the solution.

Thanks!
 

FAQ: Angular velocity with time varying moment

What is angular velocity with time varying moment?

Angular velocity with time varying moment is a measure of how quickly an object is rotating around a fixed point, while also taking into account any changes in the moment of inertia (a measure of an object's resistance to changes in its rotation). This type of angular velocity is commonly seen in systems where the moment of inertia is changing over time, such as a spinning top or a gyroscope.

How is angular velocity with time varying moment calculated?

The formula for calculating angular velocity with time varying moment is ω = (dθ/dt) + (I/I0)(dI/dt), where ω represents angular velocity, θ represents the angular displacement, t represents time, I represents the moment of inertia at a given time, and I0 represents the initial moment of inertia. This formula takes into account both the rate of change of angular displacement and the rate of change of moment of inertia.

What are some real-world applications of angular velocity with time varying moment?

Angular velocity with time varying moment is commonly used in engineering and physics to analyze the motion of rotating systems. It has applications in fields such as aerospace, robotics, and mechanics. For example, it can be used to study the movement of satellites, the stability of spinning objects, and the behavior of rotating machinery.

How does angular velocity with time varying moment differ from constant angular velocity?

Constant angular velocity refers to a situation where the angular velocity remains the same throughout the rotation of an object. In contrast, angular velocity with time varying moment takes into account changes in the moment of inertia, which can cause the angular velocity to change over time. This means that the rate of rotation can vary even if the angular displacement remains constant.

How does angular velocity with time varying moment relate to angular acceleration?

Angular velocity and angular acceleration are related by the formula α = (dω/dt) = (d^2θ/dt^2) + (I/I0)(d^2I/dt^2), where α represents angular acceleration. This means that angular velocity with time varying moment is influenced not only by changes in angular displacement, but also by changes in angular acceleration and moment of inertia. In other words, the rate of change of angular velocity is affected by both changes in the rotation and changes in the object's resistance to rotation.

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