Rotational Kinematics of a disk

AI Thread Summary
The discussion revolves around a problem involving the rotational kinematics of a disk that undergoes constant angular acceleration. Initially at rest, the disk moves from an angle of -90° to 130° over 3.15 seconds. Participants emphasize the need to apply rotational kinematics equations to determine the angular speed after the disk completes one full revolution back to -90°. There is a clear focus on using kinematic principles rather than dynamics to solve the problem. The solution requires calculating the angular velocity based on the given parameters and kinematic equations.
Batman4t
Messages
5
Reaction score
0

Homework Statement



A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at q0 = -90.0°. The disk then undergoes constant angular acceleration. After accelerating for 3.15 s, the reference line has been moved part way around the circle (in a counterclockwise direction) to qf = 130°.

Given this information, what is the angular speed of the disk after it has traveled one complete revolution (when it returns to its original position at -90.0°)?

Homework Equations



http://www.ajdesigner.com/phpcircularmotion/centripetal_acceleration_equation.php

The Attempt at a Solution



Not sure I know have to use Rotational Kinematics to find the angular velocity first.
 
Physics news on Phys.org
You have to use only the eqns of Rotational Kinematics, not dynamics.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

What is the net acceleration of the coin on a rotating disk?
Replies
2
Views
2K
Perfectly inelastic collision of two moving and rotating disks
Replies
9
Views
2K
What is the Angular Velocity Acquired by a Disk on a Rotating Platform?
Replies
28
Views
4K
Conservation of Energy and Angular Momentum in a Rotating Train-Disk System
Replies
30
Views
3K
Rotational motion homework question
Replies
1
Views
2K
Two Rotating Disks Contacting Along Edge
Replies
2
Views
2K
Rotational Momentum: Calculating Angular Speed After Cockroach Stops
Replies
2
Views
2K
Determining the Speed of a Rotating Disk with a Constant Force
Replies
10
Views
3K
Moment of Inertia: Disk 1 & 2 Homework
Replies
1
Views
2K
Friction and Rotation: Understanding the Ratio of Forces on a Rotating Disk
Replies
5
Views
1K

Hot Threads

Recent Insights

Back
Top