- #1

dtl42

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## Homework Statement

A spaceborne energy storage device consists of two equal masses connected by a tether and rotating about their center of mass. Additional energy is stored by reeling in the tether; no external forces are applied. Initially the device has kinetic energy E and rotates at angular velocity ω. Energy is added until the device rotates at angular velocity 2ω. What is the new kinetic energy of the device?

## Homework Equations

Not sure.

## The Attempt at a Solution

I guessed that since kinetic energy is related to angular velocity squared, it would be 4E, but the answer is 2E.