(II) Energy may be stored by pumping water to a high reservoirwhen demand is low and then releasing it to drive turbinesduring peak demand. Suppose water is pumped to a lake115 m above the turbines at a rate of 1.00 × 10° kg/s for10.0 h at night. (a) How much energy (kWh) is needed to dothis each night? (b) If all this energy is released during a 14-hday, at 75% efficiency, what is the average power output?(ID Water is stored in an artificial lake created by alam

Answered: Image /qna-images/answer/69205547-7482-4b3d-8da9-0aaeddbf2cbd.jpg

Answered: (II) Energy may be stored by pumping…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 42P

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Coal is lifted out of a mine a vertical distance of 50 m by an engine that supplies 500 W to a conveyer belt. How much coal per minute can be brought to the surface? Ignore the effects of friction.
To increase the efficiency of a Carnot engine, should the temperature of the hot reservoir be raised or lowered? What about the cold reservoir?
An engine is found to have an efficiency of 0.40. If it does 200 J of work per cycle, what are the corresponding quantities of heat absorbed and discharged?
Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. For some industries, a payback period is as small as 2 yeas) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average T for the 120-day heating season to be 15.0 .
b) Energy may be stored for use during peak demand by pumping water to a high reservoir when needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of 1.35 x 10 kgs" for 10 hrs at night. ) How much energy (kWh) is needed to do this each night. i) If all this energy is released during a-14 h day, at 75% efficiency, what is the average power output? e) State three forms of environmental polution and how they can be prevented.
#1) in 2021, the tallest building in the world, the Burg khalifa, klas estimated at $1.5 billion. Suppose used to pay for an ordinary used. by 0.35 KW micro klave oven at a rate of $0.56/kw-h. this money the energy KS (e) How much energy with this $1.5 billon? to (in kJ) can be supplied (b) How long (in years) can the microwave oven be powered? please show step by step workings.
(ii) Electrical Energy (in kWh) consumed by two Electric Freezers of rating 1500 W for 24 h of each day= (iii) Electrical Energy(in kWh) consumed by ten Tube lights of rating 20 W for 12 h of each day = (iv) Total energy(in kWh) consumed in the month November'2020 = (v) Electricity bill(in riyals) for the month of November'2020 =
At typical nuclear power plants, refueling occurs every 17 months. Assuming that a plant has operated continuously since the last refueling and produces 1.6 GW of electrical power at an efficiency of 25%, how much less massive are the fuel rods at the end of the 17 months than at the start? (Assume 30-day months.)
Why do we not use brakes with more than 80% efficiency in automobiles? Whatshould be the minimum stopping distance for a car running at 80 kph?
hei energymaybe%ﬁ(}l'?'l‘akeg 98:1&9.'2 ‘
(III) A typical compact car experiences a total drag force of about 350 N at 55 mi/h. If this car gets 32 miles per gallon of gasoline at this speed, and a liter of gasoline (1 gal = 3.8 L) releases about 3.2 × 107 J when burned, what is the car's efficiency?
(II) How much less per year would it cost a family to operatea heat pump that has a coefficient of performance of 2.9 thanan electric heater that costs $2000 to heat their home for ayear? If the conversion to the heat pump costs $15,000, howlong would it take the family to break even on heating costs?How much would the family save in 20 years?

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