A contestant in a winter games event pushes a rock across a frozen lake (frictionless) with a force of 25 N at 60° below the horizontal as shown in Figure (a) below. It moves with an acceleration of 0.5 m/s2 to the right. Calculate the mass of the rock in kg. Ignore Figure (b). b)

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:

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

grav forces affect all objects magnetic forces affect magnetic objects and electric currents