physics - Heat transfer

A round scar of area 'A' is formed on the chest of a man of temperature 37C. The rate of heat radiated from this scar is 1% more than that from the remaining part of the body. What will be the excess temperature at this scar over other parts of the body?

  1. 👍 0
  2. 👎 0
  3. 👁 56
asked by uma
  1. 37C = 310.2 K is the internal body temperature. (Actually, that is usually not the SURFACE temperature, which is affected by air temperature, wind speed and sweat evaporation)

    I assume you are talking about the rate per unit area. Otherwise you would have to know the value of A, and the rest of the body.

    To radiate 1% more per unit area than a 310.2K surface, T^4 will have to be 1% higher than 310^4. (That comes from the Stefan-Boltzmann law, which you are probably learning about).

    (T/310.2)^4 = 1.01
    T/310.2 = 1.00249
    T = 311.0 degrees K
    = 37.8 C

    1. 👍 0
    2. 👎 0
    posted by drwls

Respond to this Question

First Name

Your Response

Similar Questions

  1. english

    How would I write this in a summary: 10. Somatotonic Mesomorph. If a man is definitely a broad type rather than a thick or long type, he is likely to be rugged and have lots of muscle. He is apt to have big forearms and legs, and

    asked by jennifer on February 7, 2016
  2. english

    I have to summarize this: Somatotonic Mesomorph. If a man is definitely a broad type rather than a thick or long type, he is likely to be rugged and have lots of muscle. He is apt to have big forearms and legs, and his chest and

    asked by jennifer on February 7, 2016
  3. math

    samuel is painting the toy chest shown in the diagram (including the bottom). He needs to know the surface area to determine how much paint to buy.Which of the following is the surface area of the chest.

    asked by HELP PLZ on March 15, 2017
  4. physics

    a tool chest is in contact with the floor points A & B. If a force 'F' is applied at an exceeded height 'h', the chest will tip over before it slips. If the coefficient of static friction between the floor and the chest is μs

    asked by Anonymous on December 5, 2011
  5. MEDICAL CODING

    Use the CPT, ICD-9-CM, and ICD-10-CM manuals to assign the appropriate procedure, modifier, and diagnosis codes to the following case scenario. Preoperative Diagnosis: Right Pneumothorax Postoperative Diagnosis: Same Procedure

    asked by MEHUL on March 22, 2015
  6. physics

    Ice of mass 11.0 kg at 0.00° C is placed in an ice chest. The ice chest has 3.00 cm thick walls of thermal conductivity 1.00 10-5 kcal/s · m · C° and a surface area of 1.25 m2. (a) How much heat must be absorbed by the ice

    asked by Alex on April 16, 2012
  7. Physics

    Ice of mass 12.0 kg at 0.00° C is placed in an ice chest. The ice chest has 3.10 cm thick walls of thermal conductivity 1.00 10-5 kcal/s · m · C° and a surface area of 1.20 m2. (a) How much heat must be absorbed by the ice

    asked by Tyler on April 11, 2017
  8. Material Science

    A polystyrene ice chest contains 3 kg of ice at 0 degrees Celsius. Triangle H for melting = 3.34 x 10 to the 5 power J/kg p = 1000 kg/m cubed, CP =4190 J/ (kg K). Heat transfer is limited by conduction (k=0.06W/m K)) from the

    asked by Joy on August 24, 2013
  9. Material Science

    A polystyrene ice chest contains 3 kg of ice at 0 degrees Celsius. Triangle H for melting = 3.34 x 10 to the 5 power J/kg p = 1000 kg/m cubed, CP =4190 J/ (kg K). Heat transfer is limited by conduction (k=0.06W/m K)) from the

    asked by Joy on August 24, 2013
  10. PHYSICS

    An ice chest at a beach party contains 12 cans of soda at 2.69 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.05-kg watermelon at 24.1 °C to the chest. The specific

    asked by KS on May 13, 2015

More Similar Questions