How Much Torque to Spin a Disk at 30,000 RPM?

  • Thread starter Thread starter bcjirvin
  • Start date Start date
  • Tags Tags
    Torque
AI Thread Summary
To spin a disk with a mass of 54.3 grams at 30,000 RPM, the required torque depends on overcoming initial inertia, friction, and air resistance. In a frictionless scenario, no torque is needed to maintain constant speed, but torque is necessary to accelerate the disk from rest. The discussion emphasizes the importance of specifying units for mass and understanding the context of torque application. The formula for torque typically involves factors such as moment of inertia and angular acceleration. Proper calculations and considerations of friction and resistance are essential for accurate torque determination.
bcjirvin
Messages
3
Reaction score
0
Hi, I'm new to this forum so I'm not exactly sure if I'm posting in the right place. But I have a question about torque.

Okay so, how much torque would a motor need to supply to be able to spin a disk with a mass of 54.3 g at 30,000 RPM?

If you could also provide and explain the formula for determining torque that would be great.

Thanks!
 
Last edited:
Physics news on Phys.org
bcjirvin said:
Hi, I'm new to this forum so I'm not exactly sure if I'm posting in the right place. But I have a question about torque.

Okay so, how much torque would a motor need to supply to be able to spin a disk with a mass of 54.3 at 30,000 RPM?

If you could also provide and explain the formula for determining torque that would be great.

Thanks!

Welcome to the PF.

What is the context of the question? It takes no torque to spin a disk on frictionless bearings at a constant RPM. The torque would be needed to spin the disk up from zero to final speed, and to overcome bearing friction and any air resistance involved.

Also you need units on the mass that you supplied...
 

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
View full post »

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
View full post »

Similar threads

B How to Calculate Power and Torque for a 15kg Load at 15 RPM?
Replies
7
Views
2K
B The physics of flywheel launchers (like tennis ball shooters)
2
Replies
60
Views
4K
I Transmission of torque using friction
Replies
32
Views
3K
Spinning up a flywheel with a motor
Replies
43
Views
5K
How large of a flywheel can my motor spin?
Replies
12
Views
11K
Torque needed to mantain a disk rotating
Replies
2
Views
3K
A Modeling the damping of a physical rigid pendulum
Replies
1
Views
2K
Quantifying Acceleration in Non-Perpendicular Torque Systems
Replies
5
Views
1K
Torque Calculation on a Spinning Wheel
Replies
2
Views
4K
How Can A High-Torque Motor Have Low a low RPM
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top