Not calc based tangential and angular acceleration

AI Thread Summary
The discussion focuses on calculating the magnitude of angular acceleration for a disk rotating with constant angular acceleration. The initial angular speed is given as 2π rad/s, and after rotating through 10π rad, the final angular speed is 7π rad/s. Participants suggest using kinematic equations that relate angular velocity, angular acceleration, and angular displacement, rather than the basic definitions involving time. There is a recommendation to learn and memorize the equations of motion for translational motion as a foundational step. The conversation emphasizes the need for clarity in applying the correct equations to solve the problem effectively.
darlagatsch
Messages
2
Reaction score
0

Homework Statement


a disk rotates with constant angular accel. the initial angular speed of the disc is 2pie rad/s. After the disk rotates through 10pie rad, the ang speed is 7pie rad/s.

Homework Equations


a. what is the mag of the angular accel?


The Attempt at a Solution


alpha=delta omega/delta time
omega=delta theta/delta time
etiher or both?
 
Physics news on Phys.org
darlagatsch said:

Homework Statement


a disk rotates with constant angular accel. the initial angular speed of the disc is 2pie rad/s. After the disk rotates through 10pie rad, the ang speed is 7pie rad/s.

Homework Equations


a. what is the mag of the angular accel?


The Attempt at a Solution


alpha=delta omega/delta time
omega=delta theta/delta time
etiher or both?
the first one has 2 unknowns and the second one is wrong...why not try one of the other kinematic equations for constant angular acceleration...the one that relates omega with alpha and theta?
 
i have no idea! HELLLP
 
darlagatsch said:
i have no idea! HELLLP
Well you seem to have known somehow that alpha=delta omega/delta time, how did you know that? You can find the equations on the link below, 4th slide:

http://www.colorado.edu/physics/phys2010/phys2010_fa11/LectureNotes/phys2010_fa11_lecture28.pdf

You should first learn, understand, and memorize the motion equations for translational motion.
 
Last edited by a moderator:
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Angular velocity and angular acceleration of a turbine
Replies
17
Views
3K
Solve Angular Velocity & Acceleration - Dimensional Analysis
Replies
3
Views
2K
Relating Linear and Angular Kinematics
Replies
3
Views
2K
Perfectly inelastic collision between Projectile and a hinged disk
Replies
26
Views
1K
Centripetal Acceleration while Swinging a Stone on a String
Replies
9
Views
2K
What is the final angular displacement of a disk hit by two masses?
Replies
3
Views
2K
How Do You Correctly Cancel Angular Momentum in Physics Problems?
Replies
3
Views
1K
Angular momentum and a summersault problem
Replies
19
Views
2K
How Is Acceleration Calculated in Rotational Motion?
Replies
13
Views
2K
Tangential acceleration and centripetal acceleration
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top