- #1
Justanotherstudent
Right I am so stumped on part b of this question so I will post part a too so that you guys may check to see if I did that correctly.
a) object heated to 230 celius is placed inside a 25 celius room. Determine net rate of heat
loss due to raiation if object has surface area of 68 cm^2 and an emissivity of
0.780.
b) estimate the temp of object after 1 min if its density is 3.60 *10^3 kg/m^3 and its
specific heat is 768 J/kg*degress celius.
My work for a)
Actually I used a simliar equation to solve the first problem
change in Q/time = q for limitations of kboard
emissivity=e
bolstman constant= o
temp = T, Te= temp of environment To=temp of obj
a=area
q=eoA(Te^4-To^4)
so my quation for a was
q=.78(5.67*10^-8)(.68)(25^4-230^4)
q= -84.1 w/s
as for part b I have no idea how to work density into any of the equations I have at all... driving me mad
a) object heated to 230 celius is placed inside a 25 celius room. Determine net rate of heat
loss due to raiation if object has surface area of 68 cm^2 and an emissivity of
0.780.
b) estimate the temp of object after 1 min if its density is 3.60 *10^3 kg/m^3 and its
specific heat is 768 J/kg*degress celius.
My work for a)
Actually I used a simliar equation to solve the first problem
change in Q/time = q for limitations of kboard
emissivity=e
bolstman constant= o
temp = T, Te= temp of environment To=temp of obj
a=area
q=eoA(Te^4-To^4)
so my quation for a was
q=.78(5.67*10^-8)(.68)(25^4-230^4)
q= -84.1 w/s
as for part b I have no idea how to work density into any of the equations I have at all... driving me mad