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$\bullet$ $\bullet$ Solar energy. The sun transfers energy to the earth by radi-ation at a rate of approximately 1.0 kW per square meter of sur-face. (a) If this energy could be collected and converted toelectrical energy with 25$\%$ efficiency, how large an area (insquare kilometers) would be required to collect the electricalenergy used by the United States? (See the provious problem.)(b) If the solar collectors were arranged in a square array, whatwould be the length of its sides in kilometers and in miles? Doesan array of these dimensions seem technologically feasible?

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a) $1.3 \times 10^{3} \mathrm{km}^{2}$b) 22 $\mathrm{mi}$ Yes, it is possible to arrange such an array.

Physics 101 Mechanics

Chapter 7

Work and Energ

Physics Basics

Applying Newton's Laws

Kinetic Energy

Potential Energy

Energy Conservation

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In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

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In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

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problem. 69. In this problem, it is given that the weight off solar energy received is a call to one kilowatt. But meter is square. And total consumption energy in us is one indu 10 to the power 19 Jules, but yeah, no. We have to calculate the idea required for the solar collectors if 25% off the solar energy can be converted. So the electrical energy and to satisfy the demand off U. S. A. For the little energy off one year. So we can write 25 by 100 in tow. 1000 Jules, but a second me Terry square into required area. Is it cool, too? One Indu Trento the power 19 jos. But year because on little deeper percent off the energy off, son, can we converted to the electrical energy and the total electrical energy required is equal to the consumption off the U. S. A. So we can write 2 50 and this is total area jewels were second meter squared is equal to sent to the power 19 Jules, but 3 65 into 24 into 3600 seconds. This implies that equals and yours and Jules will cancel second and second will cancel. Does we'll get equals one fine. 27 into 10 to the power three kilometer square for the second part of the question. Bye. We for this area. We have to get make. I square shipped collector with side l, then the area of the collector Should we call to the area calculated in the party which is 1.27 into 10 to the power three. Kill me there squares now taking root on both sides We get eloquence 35.63 kilometer which is equal to 22 0.14 miles. This shape off the collector. It's possible to manufacture with the use off the modern technologies and modern equipments.

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