The Poetry of Physics Answers

9 verified answers6 views
5

Which excerpt from Neil deGrasse Tyson’s “Death by Black Hole” best provides evidence that escape from a black hole is impossible?

A
. . . the speed required to escape a black hole is greater than the speed of light itself. . . . light travels at exactly 299,792,458 meters per second in a vacuum and is the fastest stuff in the universe.
B
But if the black hole were 6,000 feet across, then the same man’s feet would be only one-tenth of 1 percent closer to the center than his head, and the difference in gravity—the tidal force—would be correspondingly small.
C
Meanwhile, the stuff within the event horizon has collapsed to an infinitesimal point at the black hole’s center. So black holes are not so much deadly objects as they are deadly regions of space.
D
If you stumbled upon a black hole and found yourself falling feet-first toward its center, then as you got closer, the black hole’s force of gravity would grow astronomically.
6

Read the excerpt from Neil deGrasse Tyson’s “Death by Black Hole.”As far as I know, nobody has ever been eaten by a black hole, but there is compelling evidence to suggest that black holes in the universe routinely dine upon wayward stars and unsuspecting gas clouds. As a cloud approaches a black hole, it hardly ever falls straight in. Unlike your choreographed feet-first fall, a gas cloud is typically drawn into orbit before it spirals to its destruction. The parts of the cloud that are closer to the black hole will orbit faster than the parts that are farther away. Known as differential rotation, this simple shearing can have extraordinary astrophysical consequences. As the cloud layers spiral closer to the event horizon they heat up, from internal friction, to upwards of a million degrees— much hotter than any known star. The gas glows blue-hot as it becomes a copious source of ultraviolet and x-ray energy. What started as an isolated, invisible black hole (minding its own business) has now become an invisible black hole encircled by a gaseous speedway, ablaze with high-energy radiation.Which of the following suggestions would be most beneficial for a reader in order to gain a better understanding of the information presented in this excerpt?

A
Skim encyclopedias to learn star names and locations.
B
Review scientific journals explaining the various types of clouds.
C
Read a variety of sources about the formation of black holes.
D
Search web pages focused on personal encounters with black holes.
9

Read the excerpt from “Death by Black Hole.”If you were made of rubber then you would just stretch in response. But humans are composed of other materials such as bones and muscles and organs. Your body would stay whole until the instant the tidal force exceeded your body’s molecular bonds. (If the Inquisition had access to black holes, this, instead of the rack, would surely have become the stretching device of choice.)Which sentence from the excerpt supports the idea that falling into a black hole would be a violent death?

A
If you were made of rubber then you would just stretch in response.
B
But humans are composed of other materials such as bones and muscles and organs.
C
Your body would stay whole until the instant the tidal force exceeded your body’s molecular bonds.
D
If the Inquisition had access to black holes, this, instead of the rack, would surely have become the stretching device of choice.
10

Read the excerpt from “Death by Black Hole.”If you stumbled upon a black hole and found yourself falling feet-first toward its center, then as you got closer, the black hole’s force of gravity would grow astronomically.Read the stanza from “Man Listening to Disc.”This is not bad—ambling along 44th Streetwith Sonny Rollins for company,his music flowing through the soft calipersof these earphones,Which statement best summarizes the two excerpts?

A
In both pieces the narrators are in grave danger.
B
In both pieces the narrators are carefree and in no apparent hurry.
C
In both pieces the narrators are unable to connect with others.
D
In both pieces the narrators are unaware of their surroundings.

Did you find these answers helpful?