Aboat has a porthole window, of area 0.00849 m^2, 6.25 m below the surface. the density of sea water is 1027 kg/m^3. the air inside the boat is at 1 atm. what is the net force on the window?

1391.54 N

Explanation:

Area of window, A = 0.00849 m^2

Depth, h = 6.25 m

density of sea water, d = 1027 kg/m^3

Atmospheric pressure, Po = 1 atm = 1.01 x 10^5 Pa

Pressure at window,

P = Po + h d g

P = 1.01 x 10^5 + 6.25 x 1027 x 9.8 = 163903.75 Pa

Force on window = Pressure on window x Area of window

F = 163903.75 x 0.00849 = 1391.54 N

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:

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.