COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 20, Problem 14QAP
To determine
Dams required to suffice the energy requirement in USA per year
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In a hydroelectric dam, water falls 30.0 mm and then spins a turbine to generate electricity.
You may want to review (Pages 234 - 238) .
What is ΔUΔUDeltaU of 1.0 kg of water?
Express your answer with the appropriate units.
Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 51.0 MWMW of electricity? This is a typical value for a small hydroelectric dam.
Express your answer using three decimal places.
Please show me how to cancel the unit for in transforming Watts/(rad/s) --> N-m
A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time:(a) How many people would it take to run a 4.00 kW electric clothes dryer? people
Chapter 20 Solutions
COLLEGE PHYSICS
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- Explain, in terms of the definition of power, why energy consumption is sometimes listed in kilowatt-hours rather than joules. What is the relationship between these two energy units?arrow_forwardAs shown in Figure CQ33.6, a person pulls a vacuum cleaner at speed v across a horizontal floor, exerting on it a force of magnitude F directed upward at an angle with the horizontal. (a) At what rate is the person doing work on the cleaner? (b) State as completely as you can the analogy between power in this situation and in an electric circuit.arrow_forwardDo devices with efficiencies of less than one violate the law of conservation of energy? Explain.arrow_forward
- What is the difference between energy conservation and the law of conservation of energy? Give some examples of each.arrow_forwardConstruct Your Own Problem Consider humans generating electricity by pedaling a device similar to a stationary bicycle. Construct a problem in which you determine the number of people it would take to replace a large electrical generation facility. Among the things to consider are the power output that is reasonable using the legs, rest time, and the need for electricity 24 hours per day. Discuss the practical implications of your results.arrow_forwardWhich of the following is a unit of work? (4.1) (a) W (b) J s (c) N/s (d) N marrow_forward
- A large household air conditioner may consume 15.0 kW of power. What is the cost of operating this air conditioner 3.00 h per day for 30.0 d if the cost of electricity is $0.110 per kW h?arrow_forwardList the energy conversions that occur when riding a bicycle.arrow_forwardCheck Your Understanding Repeat Example 8.10 when the particle’s mechanical energy is +0.25 J.arrow_forward
- A 3.50-kN piano is lilted by three workers at constant speed to an apartment 25.0 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 165 W of power, and the pulley system is 75% efficient (so that 25% of the mechanical energy is lost due to friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment.arrow_forwardIn 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant speed? (b) What total force was exerted on Arfeuilles teeth during the lift?arrow_forwardi cant get the answer for this but we are supposed to use The Law of conservation of Energy!!arrow_forward
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