Aperson is walking outdoors on a cold day when the temperature is -20°c. he is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales 0.0050 m3 of air. at what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°c) before it is exhaled? the specific heat of air is 1020 j/kg ∙ k and the density of air is 1.29 kg/m3.

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:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

d eras and periods