Asked by ABAINEH
50. Which of the following best describe the quantitative relationship among work, energy, and power in physics?
A. Power is the energy possessed by an object, and work is the rate at which power is used.
B. Energy is the force applied over time, and power is the result of work done.
C. Work done is the transfer of energy, and power is the rate at which work is done or energy is transferred.
D. Work and energy are unrelated to power.
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Answer: C.
Explanation: Work is the transfer of energy (W = F · d, or ΔE), and power is the rate at which work/energy is transferred: average P = W/t, instantaneous P = dW/dt = dE/dt (and for a force P = F · v). Units: work/energy in joules (J), power in watts (W = J/s).
Explanation: Work is the transfer of energy (W = F · d, or ΔE), and power is the rate at which work/energy is transferred: average P = W/t, instantaneous P = dW/dt = dE/dt (and for a force P = F · v). Units: work/energy in joules (J), power in watts (W = J/s).
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