3. A 1 sq. m Solar Panel receives 1kW of Total Solar Radiation. If you were to u

Question

3. A 1 sq. m Solar Panel receives 1kW of Total Solar Radiation. If you were to use such a panel to power an Average US home, which of the following statements is true? A. You cannot power the home because the size of the described solar panel will not fit in the area of an average US home B. You cannot power the home because the efficiency of the available Solar Panels are not adequate C. You can power the home because the Average US home power requirement is less than 1/10th the solar power on the solar panel D. You cannot power the home because the average power requirement for US homes is more than 10 times the solar power on the solar panel. E. You can power the home because the currently available solar panels have over 90% efficiency 4. A perfectly elastic rubber band's natural length under with no stretch(force) is 10cm. When stretched by a forc of 2N, its length becomes 18cm. If stretched by 3N, its length would be: (Hint: Recall Hooke's law) A. 13cm B. 11cm C. 10cm D. 22cm E. 18cm

Explanation / Answer

3. C and E.

4. F is proportional to stretched length.(Hook's law)

F= k(x-x0)

k = F/(x-x0) = 2/(18-10) = .25 N/cm

F' = k(x'-x0)

x' = F'/k +x0 = 3/.25 + 10 = 22 cm

  

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