Power quiz Flashcards
Power quiz
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Which of the following statements about power is true?
Power is defined as the rate at which work is done or energy is transferred, calculated as work done divided by time (P = W/Δt) or energy per unit time (P = E/t). The unit for power is the watt (W), which is equivalent to one joule per second (J/s). What is the definition of power in physics?
Power is defined as the rate at which work is done or energy is transferred, calculated as work done divided by time (P = W/Δt) or energy per unit time (P = E/t). What is the unit of power and how is it related to joules and seconds?
The unit for power is the watt (W), which is equivalent to one joule per second (J/s). How do you calculate the energy consumption of a 100-watt light bulb over an hour?
The energy consumption is calculated using the formula E = P * t, resulting in 360,000 joules for a 100-watt bulb over 3600 seconds (1 hour). What is the relationship between work and energy in the context of power?
Work is a transfer of energy, and power is the rate at which this work is done or energy is transferred. How do you calculate average power delivered by a car engine using kinetic energy?
Average power is calculated using the change in kinetic energy divided by time, P = ΔKE/Δt, where ΔKE = 0.5 * m * v^2 - 0.5 * m * u^2. What is the average power output of a 1300 kg car accelerating to 40 m/s over 7 seconds?
The average power output is 1.49 x 10^5 watts or 149 kilowatts. How is the concept of average power related to time intervals?
Average power is calculated between two points in time, representing how quickly work is done or energy is transferred over that interval. What equation is used to calculate work when force and displacement are known?
Work can be calculated using the equation W = F * d * cos(θ), where F is force, d is displacement, and θ is the angle between force and displacement. How does the kinetic energy theorem relate to calculating work done by a force?
The kinetic energy theorem states that the net work done on an object is equal to the change in its kinetic energy, allowing work to be calculated as ΔKE = 0.5 * m * v^2 - 0.5 * m * u^2.
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