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10 January, 11:23

Which of the following describes the energy transformation that takes place when a boy eats an apple and then lifts weights?

1. Chemical energy is converted to mechanical and heat energy.

2. Chemical energy is converted to mechanical energy.

3. Chemical energy is converted to heat energy.

4. Chemical energy is converted to mechanical and kinetic energy.

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  1. 10 January, 13:04
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    the correct answer is 1. Chemical energy is converted to mechanical and heat energy.

    When the boy eats apple, the chemical energy of the apple first converted in the heat energy in the process of digestion, which maintains our body temperature, than the body of the boy converts the heat energy into mechanical energy.

    Therefore the correct option is 1.
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