| 1. | :This gives 5 J for the rotational energy in a small helicopter.
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| 2. | The tree roots may rotate, via the rotational energy of the rockfall.
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| 3. | The rotational energy typically comes from an engine or electric motor.
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| 4. | A second consideration is the rotational energy stored in the wheels.
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| 5. | Part of the earth's rotational energy can also be tapped using tidal power.
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| 6. | Where friction is important, like on Earth, objects lose rotational energy and stop spinning.
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| 7. | Energy is stored in the rotor as kinetic energy, or more specifically, rotational energy:
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| 8. | A "'flywheel "'is a rotating mechanical device that is used to store rotational energy.
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| 9. | This expression is without translational energy, rotational energy, vibrational excitations, and other such considerations.
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| 10. | Another example of actually using earth's rotational energy is the locating of opportune spaceports.
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