Homework Help: Physics

Posted by Joe on Saturday, January 19, 2013 at 7:43pm.

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 Sun’s 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 lizard’s 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?

Physics - bobpursley, Saturday, January 19, 2013 at 7:52pm
What is your question about this?
Physics - Joe, Saturday, January 19, 2013 at 8:07pm
a) If the lizard has a specific heat of 4.2 J/(g x C), what is rate of increase of the lizard’s 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?
Physics - bobpursley, Saturday, January 19, 2013 at 9:10pm
I think you might be answer grazing.

HeatLizardabsorbs=.5 heat sun
mass*c*deltaTemp=.5*Intensity*area*time
deltaTemp/time= you do the math.

then for part b, calculate time for a deltaTemp of 5.
deltaTEmp/time known in part a.
part a= 5C/time calculate time

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