Physics problem: body heat loss via radiation

[crystal1001]

Homework Statement

A student is trying to decide what to wear. His bedroom is at 20°C. His skin temperature is 35°C. The area of his exposed skin is 1.50 m2. People of all races have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy loss from his body by radiation in 10.0 min.

Relevant Equations

q = ε σ T4 A
σ = 5.6703 10-8 (W/m2K4) - The Stefan-Boltzmann Constant

I do not know where I am doing wrong. I asked a tutor, he said I was doing it correctly.
Below is my work. Please help!

Net loss by radiation in 10.0 mins is 74.8 kJ

 

[phinds]

So, you are asking for the favor of someone checking your homework and you're going to make it hard for them by posting it sideways? Doesn't really seem like a good idea.

 

[crystal1001]

corrected it.

 

[berkeman]

corrected it.

It's still sideways for me. Maybe try taking a screenshot of it after you rotate it, and attach the screenshot. I'll try to do that now...

 

[phinds]

Yeah, still sideways for me to. Also, this is a duplicate of https://www.physicsforums.com/threads/physic-radiation-problem.980186/#post-6259082

 

[berkeman]

Here's the work picture rotated and contrast-enhanced. I'll look to see if we should merge the duplicate thread...

 

[berkeman]

Yeah, still sideways for me to. Also, this is a duplicate of https://www.physicsforums.com/threads/physic-radiation-problem.980186/#post-6259082

That link just points to this thread (for me)...

Edit -- found the other thread and merged it into this one.

 

[Bystander]

What's the expansion of T plus (or minus) delta T?