Acannon, positioned on a hill, shoots a cannonball horizontally at 23 m/s. the cannonball hits the stone wall 1.96 m below the height it was shot. how far away is the cannon from the wall?

14. 49 m

Explanation:

We can solve this problem with the following equations:

(1)

(2)

Where:

is the horizontal distance between the cannon and the ball

is the cannonball initial velocity

since the cannonball was shoot horizontally

is the time

is the final height of the cannonball

is the initial height of the cannonball

is the acceleration due gravity

Isolating from (2):

(3)

(4)

(5)

Substituting (5) in (1):

(6)

Finally:

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:

the answer would be c