At noon, ship a is 50 nautical miles due west of ship b. ship a is sailing west at 22 knots and ship b is sailing north at 20 knots. how fast (in knots) is the distance between the ships changing at 5 pm? (note: 1 knot is a speed of 1 nautical mile per hour.)

distance between the ships changing 29.255 knot

Explanation:

Given data

time = noon to 5 pm = 5 hours

A = 50 nautical miles due west of  B

A = sailing west at 22 knots

B = sailing north at 20 knots

to find out

How fast is the distance between the ships changing

solution

we consider a to b distance is z and at noon ship at 90 degree angle of AB at x and y distance from AB respectively

so here z² = x² + y²    ..............1

and 2z z' = 2x x' + 2y y'

so z' = ( x x' + y y' ) / z

and after 5 hours

x = 50 + 22(t) = 50 + 22(5) = 160

y = 20(t) = 20 (5) = 100

so from equation 1

z² = x² + y²

z² = 160² + 100²

z =

z = 188.68

so z' = ( x x' + y y' ) / z

z' = ( 160 (22) + 100(20) ) / 188.68

z' = 29.255

distance between the ships changing 29.255 knot

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: