An energy-efficient lightbulb, taking in 23.0 W of power, can produce the same l

Question

An energy-efficient lightbulb, taking in 23.0 W of power, can produce the same level of brightness as a conventional lightbulb operating at power 100 W. The lifetime of the energy-efficient bulb is 10 000 h and its purchase price is S4.60, whereas the conventional bulb has lifetime 750 h and costs $0.50 per bulb. Determine the total savings obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. Assume an energy cost of $0.20 per kilowatt-hour. $ Need Help? Read It ChatAbout It An electric scooter has a battery capable of supplying 125 Wh of energy. If friction forces and other losses account for 60.0% of the energy usage, what altitude change can a rider achieve when driving in hilly terrain, if the rider and scooter have a combined weight of 905 N? m Need Help? Read It ChatAbout It When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 161 hp, estimate the total friction force acting on the car when it is moving at a speed of 32 m/s. One horsepower equals 746 W. N

Explanation / Answer

2.024 19.89 3753.31

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