Aperson walks first at a constant speed of 4.90 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.90m/s.
(a) what is her average speed over the entire trip? (in m/s)

The person's average speed over the entire trip was 3.9 m/s.

Explanation:

The average speed over the trip was:

s = (s₁ + s₂) / n = (4.9 m/s + 2.9 m/s) / 2 = 3.9 m/s

s: speed of the entire trip

s₁: speed in 1° section of the trip

s₂: speed in 2° section of the trip

n: number of sections

The important thing is the speed of the person walking but not the distance travelled during the trip.

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:

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete