When a muscle contracts, it performs work. it does this by a) converting chemical energy to mechanical energy. b) converting mechanical energy into heat energy. c) converting mass into energy. d) creating energy.

A) converting chemical energy to mechanical energy.

When a muscle contracts, it performs mechanical work. The chemical energy generated in the muscle cell gets converted to mechanical energy. The oxidation of carbohydrates and fats helps in contraction of muscles. The metabolic process generates ATP molecules which is a storehouse of energy. during contraction. These molecules break to generate energy.

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the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas