Amerry-go-round is a common piece of playground equipment. a 3.0-m-diameter merry-go-round with a mass of 300 kg is spinning at 16 rpm . john runs tangent to the merry-go-round at 5.4 m/s , in the same direction that it is turning, and jumps onto the outer edge. john's mass is 30 kg. what is. what is the merry-go-round's angular velocity, in rpm, after john jumps on?

Explanation:

For answer this we will use the law of the conservation of the angular momentum L where:

First, the important data is:

 (mass of the merry-go-round)

    (radius of the merry-go-round)

(angular velocity of the merry-go-round)

(velocity od jhon)

 (mass of jhon)

Then,

where is the moment of inerta after jhon jumps on,  is the moment of inertia of the merry-go-round and is the angular velocity of the merry-go-round after jhon jumps on.

So, we have to find the moment of inertia of the merry-go-round as:

Now we have to find as:

Then, we replace the data on the initial equation and we get:

Solving for :

Finally, we change it to rpm as:

what do the notation's look like?

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: