Radius and centripetal relation

[SUSUSUSUSUSUSUSU]

Homework Statement

the file given

Homework Equations

F=mv^2/r

The Attempt at a Solution

I do not understand why the centripetal force is 2a and not 2/a since the radius of X is twice longer.

When I use the equation above, raidius is inversely proportional to the acceleration.

Is radius proportional to the accerlation? Then why it is?[/B]

 

[mfb]

Both speed and radius change. And I don't see how you would place the a in the denominator. That doesn't even give an acceleration in terms of units.
The angular velocity is constant. There is an expression for the acceleration that uses the angular velocity, that makes the problem easier.

 

[SUSUSUSUSUSUSUSU]

so

Both speed and radius change. And I don't see how you would place the a in the denominator. That doesn't even give an acceleration in terms of units.
The angular velocity is constant. There is an expression for the acceleration that uses the angular velocity, that makes the problem easier.

sorry i got a/2 hahah

 

[SUSUSUSUSUSUSUSU]

so

sorry i got a/2 hahah

when i use 2R, the equation will be mv^2/2R which is a/2. this is what i have got

 

[mfb]

The speed changes as well, don’t forget that.