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April 20, 2014

Homework Help: physics

Posted by jjwatt on Saturday, January 19, 2013 at 11:31am.

A lizard of mass 3.0 g is warming itself in the bright sunlight. It casts a shadow of 1.6 cm^2 on a piece of paper help perpendicularly to the Sunís rays. The intensity of sunlight at the Earth is 1.4 x 10^3 W/m^2, but only half of this energy penetrates the atmosphere and is absorbed by the lizard.

(a) If the lizard has a specific heat of 4.2 J/(g x C), what is rate of increase of the lizardís temperature?

(b) Assuming that there is no heat loss by the lizard (to simplify), how long must the lizard lie in the sunlight in order to raise its temperature by 5.0 C?

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