Anylon guitar string is fixed between two lab posts 2.00 m apart. the string has a linear mass density of μ=7.20 g/m and is placed under a tension of 160.00 n. the string is placed next to a tube, open at both ends, of length l. the string is plucked and the tube resonates at the n=1 mode. the speed of sound is 343 m/s. what is the length of the tube?

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:

second mirror gathers light from a faraway object and reflects it to another mirror. - a.