7. Rate of Average and Instantaneous Power is: (Work, Power & Energy, power and energy)
Correct answer: C. uniform rate
- A. any rate
- B. variable rate
- C. uniform rate
- D. high rate
Explanation
Reasoning: Average power (P) = W/t and instantaneous power is the rate of work done at any given moment. If average and instantaneous power are equal, it implies the work is being done at a constant rate, meaning the speed is not changing.Incorrect Options:(a) While power can be variable, the question specifies a condition where average and instantaneous power become equal, requiring a constant rate of work.(b) Similar to option (a), the question seeks a specific case where power is constant, not variable.(d) The rate of work itself is not specified in the question. The focus is on the uniformity of the rate, not its absolute value.
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About Work and Energy
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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