One erg is equal to:
Correct answer: C. 10⁻⁷ joules
- A. 10⁻⁵ dynes
- B. 10⁻⁷ watt
- C. 10⁻⁷ joules
- D. 10⁻⁵ newton
Explanation
By definition 1 erg = 10⁻⁷ J. Thus option C is correct.
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Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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