Help needed to convert angular velocity to angular acceleration

[sherazi21st]

hi,

I've calculated
ω=5 rad/s

How can I calculate angular acceleration (α)
I've Mass, M=4Kg
Radius, R = 2m
and time taken by each single revolution, T=3sec.

 

[russ_watters]

Unless you forgot to tell us something, the angular acceleration is zero!

 

[sherazi21st]

I've only this data, what is missing?

 

[Doc Al]

I've only this data, what is missing?

How the angular velocity is changing.

Are you sure you want angular acceleration, not centripetal acceleration?

 

[sherazi21st]

I had also the same point but I got this data only. I thought there may be any method to convert this by either convert this ang. vel. to tang. vel. by rw and then it might be converted into angular acc. by using definition of centripetal acc. or something else if I'm not wrong.

 

[Doc Al]

I had also the same point but I got this data only. I thought there may be any method to convert this by either convert this ang. vel. to tang. vel. by rw and then it might be converted into angular acc. by using definition of centripetal acc. or something else if I'm not wrong.

Angular acceleration is related to tangential acceleration, not centripetal acceleration. But all you gave us is an angular velocity.

You need to describe what you are being asked to find in more detail. What did you measure? What physics topic are you studying now?

 

[sherazi21st]

How the angular velocity is changing.

Are you sure you want angular acceleration, not centripetal acceleration?

Can you tell me how will we calculate Centripetal acceleration? Just by converting w into v and then putting v in v^2/r. Am I correct?

 

[sherazi21st]

Angular acceleration is related to tangential acceleration, not centripetal acceleration. But all you gave us is an angular velocity.

You need to describe what you are being asked to find in more detail. What did you measure? What physics topic are you studying now?

Dear, I'm studying Angular acceleration and angular velocity. I am given only radius of the horizontal circle in which a mass m is moving and completes one revolution in t seconds. I guess there is fault in the question.

 

[Doc Al]

Can you tell me how will we calculate Centripetal acceleration? Just by converting w into v and then putting v in v^2/r. Am I correct?

Sure. You can also use this equivalent expression and save yourself the conversion: a_c = ω²r

 

[Doc Al]

I am given only radius of the horizontal circle in which a mass m is moving and completes one revolution in t seconds.

Is it moving with constant speed, or does it start from rest (for instance)?

 

[sherazi21st]

Is it moving with constant speed, or does it start from rest (for instance)?

constant w

 

[Doc Al]

constant w

In that case, the angular acceleration is zero, as pointed out by russ_watters earlier.

 

[nasu]

hi,

I've calculated
ω=5 rad/s

How can I calculate angular acceleration (α)
I've Mass, M=4Kg
Radius, R = 2m
and time taken by each single revolution, T=3sec.

It's either T =3s OR w=5 rad/s.
You cannot have both for the same motion, with constant angular speed.

If T=3s, the angular velocity is about 2 rad/s.