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Power and energy Energy is the capacity to do work, and power is the rate at which energy is used or consumed. Therefore, if E(t) is the energy function for a system, then P(t) = E′(t) is the power function. A unit of energy is the kilowatt-hour (1 kWh is the amount of energy needed to light ten 100-W lightbulbs for an hour); the corresponding units for power are kilowatts. The following figure shows the energy consumed by a small community over a 25-hour period.
- a. Estimate the power at t = 10 and t = 20 hr. Be sure to include units in your calculation.
- b. At what times on the interval [0, 25] is the power zero?
- c. At what times on the interval [0, 25] is the power a maximum?
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Single Variable Calculus: Early Transcendentals & Student Solutions Manual, Single Variable for Calculus: Early Transcendentals & MyLab Math -- Valuepack Access Card Package
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