Aspring is resting vertically on a table. a small box is dropped onto the top of the spring and compresses it. suppose the spring has a spring constant of 300 n/m and the box has a mass of 1.1 kg. the speed of the box just before it makes contact with the spring is 0.55 m/s. (a) determine the magnitude of the spring’s displacement at an instant when the acceleration of the box is zero. (b) what is the magnitude of the spring’s displacement when the spring is fully compressed?

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 force required to move the cart is divided by three or 33.33 n.

the answer is b, have negligible mass