Vocabulary Builder Part 13

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Question 1: Does the word root “centr” mean center?

• No

• Yes

Answer explanation

Yes. “Centr” means center.

Does a “central role” refer to a very important role?

• No

• Yes

Answer explanation

Yes. An example is the Sun's role in the water cycle

If two circles are concentric, does that mean their centers are in the same place?

• No

• Yes

Answer explanation

Yes. Concentric circles have their centers in the same place. But the radius of each circle may be different.

If someone's behavior is eccentric, does that mean just about everyone behaves that way?

• No

• Yes

Answer explanation

No. Eccentric behavior is unusual ("off center") from most people.

Test tube A has a liquid that’s more dilute than the liquid in test tube B. Is the liquid in test tube A more concentrated than the liquid in test tube B?

• No

• Yes

Answer explanation

No. The more dilute a liquid is, the less concentrated it is.

If someone is egocentric, is s/he very selfish and uncaring of others?

• No

• Yes

Answer explanation

Yes. Famous examples are autocrats, such as kings, queens and dictators.

Is a centrifugal force an imaginary force that pushes an orbiting object away from the center of its orbit?

• No

• Yes

Answer explanation

Yes. It's a pseudo-force (doesn't really exist) but it's useful to imagine when studying machines.

Is Earth's gravitational pull on the Moon an example of a centripetal force?

• No

• Yes

Answer explanation

Yes. A centripetal force keeps an object orbiting (going around) another object.