Physics, 05.03.2020 11:57 Dolphin56

Consider a sphere, an infinitely long cylinder, and a plane of infinite length and width (a, b and c below). Imagine that you can hover above each one in your own personal helicopter. In which case do you have the most freedom to move about without your view of the object changing? In other words, for each case consider if there are directions that you can move in without the objects distance or orientation, relative to you, changing.

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Answer from: tsdean21

A plane of infinite length and width.

Explanation:

For the case of the sphere, we should consider spherical coordinates.

You can move around the sphere without changing your distance from the center of the sphere, however you can alter your azimuthal angle and polar angle, since they are symmetric in spherical coordinate system.

r --> Cannot change

Φ --> Free to change

θ --> Free to change

For the case of the infinite cylinder, we should consider cylindrical coordinates.

You can change your height and angular coordinate, but you cannot change your distance from the axis of the cylinder.

r --> Cannot change

θ --> Free to change

z --> Free to change

For the case of the infinite plane, we should consider cartesian coordinates.

Since the length and width of the plane is infinite, we cannot recognize whether we are getting closer or further away.

x --> Free to move

y --> Free to move

z --> Free to move

Therefore, in the case of infinite plane you have the most freedom to move about without your view of the object changing.

Answer from: Quest

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:

Answer from: Quest

Answer the above statement is ( false );

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Consider a sphere, an infinitely long cylinder, and a plane of infinite length and width (a, b and c...

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