During a pendulum’s swing in air, which energy conversion occurs, violating ideal conservation?

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1. During a pendulum’s swing in air, which energy conversion occurs, violating ideal conservation?

1. Kinetic energy to gravitational potential energy only2. Gravitational potential energy to sound and heat3. Mechanical energy to chemical energy4. Mechanical energy to nuclear energy

During a pendulum’s swing in air, which energy conversion occurs, violating ideal conservation?