(Instantaneous power and kinetic energy) Answer the following questions with proper…
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
(Instantaneous power and kinetic energy)
Answer the following questions with proper reasoning and mathematical steps wherever required.
(i) Define instantaneous power for a mechanical system.
(ii) Starting from suitable basic relations, establish that the instantaneous power delivered to a particle equals the time-rate of change of its kinetic energy, that is, P=dtdK.
(iii) Explain why the equality obtained in part (ii) holds even when the force acting on the particle varies with time as well as with position.