Asmall steel ball rolls counterclockwise around the inside of a 30.0 cm diameter roulette wheel. the ball completes exactly 2 revolutions in 1.20 seconds. what is the ball's angular displacement after 1.24 seconds, assuming the initial angular position is 0 (in radians, round to 1 decimal).

The ball's angular displacement after 1.24 seconds is 13.0 rad

Explanation:

The ball's angular velocity is

ω = Δθ/Δt

Since the ball completes 2 revolutions in 1.20 s and each revolution corresponds to an angular displacement Δθ =2π. Thus,

ω = (2(2π rad)/1.20 s

   = 10.5 rad/s

The ball moves with a constant angular velocity, so its angular displacement at 1.24 s is

θ_f = θ_i + ωΔt

θ_f = 0 rad + (10.47 rad/s)(1.24 s)

θ_f = 13.0 rad

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:

measuring things 1 litre of water