Rate body temperature increases given rate of heat transfer?

AI Thread Summary
To calculate the rate of body temperature increase in a sauna with an ambient temperature of 57.0°C, given a skin temperature of 37.0°C, emissivity of 0.95, and body surface area of 1.60 m², the heat transfer by radiation is determined to be 226W. With a body mass of 68.0 kg and a specific heat of 3500 J/kg*K, the relationship between heat transfer and temperature change can be established using the equation Q = mC(ΔT). The challenge lies in converting the energy transfer into a rate of temperature change in degrees Celsius per second. By combining the equations for power and energy, the necessary rearrangement allows for the calculation of the temperature increase rate. This approach clarifies the connection between heat transfer and temperature change over time.
CrashMaverick
Messages
1
Reaction score
0

Homework Statement


Suppose you walk into a sauna that has an ambient temperature of 57.0°C. Calculate the rate of heat transfer to you by radiation given your skin temperature is 37.0°C, the emissivity of skin is 0.95, and the surface area of your body is 1.60 m2.

I solved this first part and found the answer to be 226W

If all other forms of heat transfer are balanced (the net heat transfer is zero), at what rate will your body temperature increase (degC/s) if your mass is 68.0 kg?

Note from instructor:

You can take the specific heat of the human body as:

c = 3500 J/kg*K

Homework Equations



Q = mC(ΔT)? Not entirely sure where to start really

m = mass
C = specific heat
ΔT = change in temperature

The Attempt at a Solution


So if you multiple C by m and ΔT(in kelvin) you end up with units of Joules right?
1 joule / 1 sec = 1 watt, I figure there is something I can do there, but I'm not sure what. The thing that is throwing me off is the units of degrees Celsius per second.

I've been staring at this problem for a couple hours and I'm sure I'm overlooking a very simple thing, any help is appreciated.
 
Physics news on Phys.org
Your relevant equation is relevant. The Q does indeed stand for energy (in Joules).

The other equation you need is Power = Energy/Time.

Put the two equations together and rearrange so that on one side you have the quantities temperature and time as those are the units specified for the answer.

Sorry for all the edits I made to this repy.
 
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...

Similar threads

Back
Top