Physics: ENERGY PRODUCTION Topical Past Paper Questions

(a) Describe the energy transfers taking place in a wind generator. (b) The maximum power that can be extracted from a wind generator is given by $ P = \frac{1}{2} \rho A v^{3} $. State one assumption made in deriving this equation. [1] (c) The following data are available for a…

A black body at temperature T (kelvin) has a peak wavelength $ \lambda $. What is the peak wavelength when the temperature increases by 33%? A. $ \frac{\lambda}{3} $ B. $ \frac{3}{4}\lambda $ C. $ \frac{4}{3}\lambda $ D. $ 3\lambda $

Planet X and planet Y both emit radiation as black bodies. Planet Y has twice the surface temperature and one third of the radius of planet X. What is $ \frac{\text{power radiated by planet } X}{\text{power radiated by planet } Y} $? A. $ \frac{9}{16} $ B. $ \frac{3}{4} $ C. $ \f…