The amount of heat per second conducted from the bloodcapillaries beneath the skin to the surface is 240 J/s. The energy istransferred a distance of 2.0 × 10-³ m through a body whose surface area is1.6 m?. Assuming that the thermal conductivity is that of body fat, determinethe temperature difference between the capillaries and the surface of the skin.1.

The equation used to calculate the amount of heat energy that flows during a time t through a medium…

Answered: The amount of heat per second conducted…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 95P: (a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I...

See similar textbooks

Similar questions

(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?
(a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?
The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m K and 0.020 W/m K, respectively, while other tissues inside the body have conductivities of about 0.50 W/m K. Assume that between the core region of the body and the skin sin face lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. (b) Find the rate of energy loss when the core temperature is 37C and the exterior temperature is 0C. Assume that both a protective layer of clothing and an insulating layer of unmoving air a absent, and a body area of 2.0 m2.
An electronics device generates 30.5 W of heat energy during normal operation. The heat is dissipated from the top surface of the device to ambient air at 23°C. If the top surface area is 0.158 m2 and the convection heat transfer coefficient is 7.838 W/m2. K, what will be the surface temperature (in °C) of the device [round your final answer to one decimal place]? Air, T. T 00 S
Radioactive decay of elements in the earth’s interior results in a mean heat flux through the Earth’s surfaceof 5×10−2Wm−2. What is the flux expressed as a fraction of the energy flux due to thermal re-radiation of absorbed solar energy? If radioactive decay were the only heat source for the Earth, what would the Earth’s temperature be?
A walrus transfers energy by conduction through its blubber at the rate of 150 W when immersed in -1.00C water. The walrus’s internal core temperature is 37.0C, and it has a surface area of 2.00m. What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood?
1. Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful. (a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.3 deg C compared with that at 33.5 deg C, such as on a person's skin? % Increase = % (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34 deg C compared with that at 20.3 deg C, such as for warm and cool automobile hoods? % Increase= %
A steam pipe is covered with 1.50-cm thick insulating material of thermal conductivity of 0.200 cal/cm · °C· s. How much energy is lost every second when the steam is at 165°C and the surrounding air is at 20.0°C? The pipe has a circumference of 800 cm and a length of 57.0 m. Neglect losses through the ends of the pipe. 3.69e12 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. MW
x. 62: 1 kg of ice occupies 1.1 × 10 m² al normal pressure. The volume changes to 1.0 x 10 m' when it is melted. Find the internal latent heat of ice. Given : Latent heat of fusion of ice = 80 kcal/kg Density of mercury = 13600 kg/m³, Mechanical equivalent of heat J = 4200 Joules/k cal.
Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful.(a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0ºC compared with that at 33.0ºC , such as on a person’s skin? (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0ºC compared with that at 20.0ºC , such as for warm and cool automobile hoods?
A metal plate 4.00 mm thick has a temperature difference of 32.0°C between 6. A metal plate 4.00 mm thick has a temperature difference of 32.0°C between its faces. It transmits 200 kcal/h through an area of 5.00 cm. Calculate the its faces. It transmits 200 kcal/h through an area of 5.00 cm. Calculate the thermal conductivity of this metal in W/m K.
Digestingfat produces 9.3 food calories per gram of fat, and typically 80%of this energy goes to heat when metabolized. (One food calorie is1000 calories and therefore equals 4186 J.) The body then movesall this heat to the surface by a combination of thermal conductivityand motion of the blood. The internal temperature of the body(where digestion occurs) is normally 37C, and the surface is usuallyabout 30C. By how much do the digestion and metabolism of a2.50 g pat of butter change your body’s entropy? Does it increase ordecrease?

SEE MORE QUESTIONS

Recommended textbooks for you

University Physics Volume 2

Physics

ISBN:

9781938168161

Author:

OpenStax

Publisher:

OpenStax

College Physics

Physics

ISBN:

9781285737027

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

Physics for Scientists and Engineers: Foundations…

Physics

ISBN:

9781133939146

Author:

Katz, Debora M.

Publisher:

Cengage Learning

University Physics Volume 2

Physics

ISBN:

9781938168161

Author:

OpenStax

Publisher:

OpenStax

College Physics

Physics

ISBN:

9781285737027

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

Physics for Scientists and Engineers: Foundations…

Physics

ISBN:

9781133939146

Author:

Katz, Debora M.

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS