# If an object is spinning with 100 m radius and the radius becomes 0 what happens?

• aviator
In summary, the conversation discusses the concept of transforming translational energy into rotational energy through the use of gearing. It is mentioned that reducing the radius can lead to the object rotating around the axis, and an initial speed of 100 m/s can be maintained through conservation of energy. The conversation also suggests taking a break from imagination and referring to a physics book for further understanding.
aviator
my educated guess is that with 0 radius the object would start rotating around the axe to keep the kinetic energy

this would mean a transformation of translation into rotation

am i correct?

First off you had to do a heck of a lot of work to reduce the radius.

not really if you crank the spinning with the pulling by gearing the axe with the radius bar

you apport a initial speed of 100 m/s to the object and according conservation of energy the object should keep those 100 m/s for ever (neglecting friction)

the bar radius would be geared with the axe transforming the spinning into pulling

i don't care how you gear it you have a lot of work to do.

Please take a break from your wild imagination and go find a physics book.

## 1. What is the relationship between an object's radius and its spinning motion?

The radius of an object is directly related to its spinning motion. The larger the radius, the faster the object will spin, and vice versa.

## 2. How does the change in radius affect the object's spinning speed?

If the radius of an object decreases, its spinning speed will increase. This is due to the conservation of angular momentum, where the product of an object's moment of inertia and angular velocity must remain constant.

## 3. Can an object's radius become 0?

In theory, an object's radius can become 0. However, this would result in an infinite spinning speed, which is impossible in reality.

## 4. What would happen if an object's radius did become 0?

If an object's radius somehow became 0, it would no longer have any rotational inertia and would cease to spin. This would also result in a loss of angular momentum.

## 5. Is there a limit to how small an object's radius can become while still maintaining its spinning motion?

Yes, there is a limit to how small an object's radius can become while still maintaining its spinning motion. This is known as the critical radius, and it is the point at which an object's moment of inertia becomes 0, causing it to stop spinning.

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