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Unformatted text preview: 1) ultraviolet lights; 2) visible lights; 3) at infrared wavelengths; 4) microwaves. Q4 (3pts). A marine biologist, Lisa, wants to know how much energy emperor penguins that live in Antarctic get from food every day. Lisa observes that penguins must maintain their body temperature at 38 C in order to survive. Can you help Lisa on this? Assume a penguin has a layer of 2cm thick feathers with a thermal conductivity of 0.03 W / m ˚K. 1m 0.4m Q5 (3pts) A spaceship is powered by solar energy. The solar panel area A is 20 m^2. The solar constant S near the earth is approximately equal to 1367 W/m^2. a) (2pts) Estimate the normal output power of the solar battery assuming the efficiency e is 25% and the panel is always directly facing the Sun. b) (1pt) The spaceship needs twice the output power estimated in a) to accomplish another mission and the solar panel needs to be upgraded. How big the panel area A should be for the new mission?...
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This note was uploaded on 11/03/2009 for the course PHYS100 100 taught by Professor Lioudmila during the Spring '09 term at UBC.
- Spring '09