Acar in an amusement park ride rolls without friction around a track (fig. p7.42). the hb car starts from rest at point a at a cr height h above the bottom of the loop. treat the car as a particle. (a) what is the minimum value of h (in terms of r) such that the car moves around the loop without falling off at the top (point b)

Explanation:

Given that

Height = h

Radius = R

From energy conservation

At point B

The minimum speed to complete the   the circle

So the kinetic energy at point B

Without falling off at the top (point 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:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it