1. Questions

Physics question

A naked person with a surface area of 1.55 meters squared and a skin temperature of 37.3 degrees is in a sauna room at T = 82.0 degrees. The person's skin has an emissivity of 0.910. She evaporates sweat from her body to balance the rate of heat absorption by radiation.
(i) Neglecting any heat production due to metabolism, what is the net rate of heat absorption by the person due to radiation? in W
(ii) How much sweat must be evaporated per hour to balance a net rate of heat absorption of H = 0.850 × 103 W? in kg/hr

  1. 👍
  2. 👎
  3. 👁
Sarah

  1. Radiation power absorbed
    = Area*sigma*emissivity*(T2^4 - T1^4)
    T1 and T2 are the skin and sauna wall temperatures, respectively, in Kelvin.
    sigma is the Stefan-Boltzmann constant. (Look it up).

    ii) Divide the heat absorption rate (W or J/s) by the heat of vaporization of water, 2.26*10^6 J/kg. Then convert kg/s to kg/hr

    1. 👍
    2. 👎
    drwls

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    A pedestal is built using a trapezoid-shaped base. Find the area of the trapezoid. A trapezoid is shown with the shorter base labeled as 4 meters, the longer base labeled as 8 meters, and the height labeled as 3 meters. A. A

  2. Math

    Find the surface area of the cylinder. Use 3.14 for pi. The cylinder's radius is 2 and the height is 15. A)100.4 cm squared B)97.43 cm squared C)36.29 cm squared*** D)33.14 cm squared

  3. Math

    find the surface area of the rectangular prism. inches are:3 ,2 and 4 those are inches for height length and width A. 60 in. (squared) B. 84 in. (squared) C. 26 in. (squared) D. 52 in. (squared) ***** Please check this for me!

  4. Math

    If two cylinders are similar, find the scale factor of the smaller figure to the larger figure. The surface area of the smaller area is 20 pi yards squared. The surface area of the larger cylinder is 125 pi yards squared. No

  1. math

    A triangular prism has bases that are equilateral triangles. Which statements are true about the surface area of the triangular prism? Choose all that apply. A triangular prism is shown. One of the sides of the triangular base is

  2. math

    a trapezoid has an area of 36 meters squared and altitude of 2 meters. its two bases in meters have ratio of 4:5 the bases are ___.

  3. Physics

    The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 250 J/s. The energy is transferred a distance of 1.7 x 10-3 m through a body whose surface area is 1.8 m2. Assuming that the

  4. physics

    A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 30° above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box? Square root of

  1. area

    what is the total area of the four walls of a rectangular room 4 meters long by 5.5 meters wide by 3 meters high? is it 4 times 5.5? then times four since there are 4 walls? 88m squared?

  2. Math

    What is the total surface area of the inside and outside of a container in the shape of a rectangular prism with length of 5 meters, width of 3 meters, and height of 2.2 meters?

  3. physics, PLEASE ANSWER, I really need help!

    The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 70.0 kg person of height 1.79 m would have a body surface area of approximately 1.90 m^2. What is the net amount of heat this

  4. Algebra 1

    Earth has a radius of about 6.4 x 10 to the 6th power m. Approximate the surface area of earth using the formula for the surface area is a sphere, S = 4 pi r squared. Earths surface is about 70 percent water. About how many square

You can view more similar questions or ask a new question.