. A person is standing (naked) inside their home. If their body temperature is 370 C and the room temperature is 200 C, i. How much power does the person radiate? (4 points) ii. How many calories would the person burn in a day (24 hours) due to this? (4 points)

(i) Power radiated by person is 6793.60 W

(ii) Calories burn by the person in a day is 1.40 x 10⁸

Explanation:

Given:

Body temperature of person, T = 370 °C = (370 +273) K = 643 K

Room temperature, T₀ = 200 °C = (200 + 273) K = 473 K

Consider the followings:

Area of the person, A = 2 m²

Emissivity of person, e = 1

Stefan's constant, σ = 5.67 x 10⁻⁸ W/m²K⁴

(i) Power radiated by the person is given by the relation:

P = σeA( T⁴ - T₀⁴)

Substitute the values in the above equation.

P = 6793.60 W

(ii) Consider Q be the energy would burn by the person in a day.

Time, t = 24 hrs = 24 x 60 x 60 s = 86400 s

The relation to determine Q is:

Q = P x t = 6793.60 x 86400

Q = 5.87 x 10⁸ J

But 1 cal = 4.18 J

So, Q = 5.87 x 10⁸/4.18

Q = 1.40 x 10⁸ cal

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation: