# Rate will this student burn calories

1. Dec 7, 2011

### lalahelp

rate will this student "burn" calories

1. The problem statement, all variables and given/known data
A student wants to lose some weight. He knows that rigorous aerobic activity uses about 700 kcal/h (2900 kJ/h) and that it takes about 2000 kcal per day (8400 kJ) just to support necessary biological functions, including keeping the body warm. He decides to burn calories faster simply by sitting naked in a 12.5° C room and letting his body radiate calories away. His body has a surface area of about 1.7 m2 and his skin temperature is 35° C. Assuming an emissivity of 1.0, at what rate will this student "burn" calories?

2. Relevant equations
dQ/dt=h.A.dT
1*1.7*295.5
=502.35 J/s

2. Dec 7, 2011

### marcoskids

Re: rate will this student "burn" calories

Is T not 288.5K ?

3. Dec 7, 2011

### marcoskids

Re: rate will this student "burn" calories

Sorry 285.5K

4. Dec 8, 2011

### lalahelp

Re: rate will this student "burn" calories

Yes your right but even with that I still get the wrong answer