Inez: The book we are reading, The Nature of Matter, is mistitled. A title should summarize the content of the whole book, but nearly half of this book is devoted to discussing a different, albeit closely related subject: energy.

Antonio: I do not think that the author erred; according to modern physics, matter and energy are two facets of the same phenomenon.

Summary

Inez says that the book The Nature of Matter should have a different title. Why? Because almost half the book is about energy, and Inez thinks a title should summarize the entire book.

Antonio thinks that the title The Nature of Matter is actually fine, because modern physics considers matter and energy to be part of the same phenomenon.

Strongly Supported Conclusions

The conversation supports these inferences:

Inez thinks that the book’s title doesn’t summarize the entire book.

Inez thinks that if the book’s title mentions matter, it should also mention energy.

Antonio either thinks that the book’s title does summarize the entire book, or that summarizing the entire book is not necessary for a good book title.

Inez and Antonio disagree about whether the book is correctly titled.

A
Inez believes that the book should be called The Nature of Energy.

This is not supported. Inez says that a book’s title should summarize the entire book, but more than half of this book is about matter. Thus, replacing “Matter” with “Energy” in the title would just make the problem worse—then it would summarize less than half of the book.

B
Antonio believes that there are no differences between matter and energy.

This is not supported. Antonio calls matter and energy “two facets of the same phenomenon,” which indicates that they are different: they’re different facets. Just because they’re part of the same phenomenon, doesn’t mean they have no differences.

C
Inez and Antonio disagree on whether matter and energy are related.

This is not supported. Inez and Antonio both feel that matter and energy are related. Inez calls them “closely related,” while Antonio explains that they’re two parts of the same phenomenon—meaning they must be related.

D
Inez and Antonio disagree about the overall value of the book.

This is not supported. Neither Inez nor Antonio actually indicates their thoughts on the overall value of the book. They’re just discussing whether or not they like the title.

E
Inez believes that the book’s title should not mention matter without mentioning energy.

This is strongly supported. Inez’s complaint is that the book’s title doesn’t summarize the book’s whole contents: the book discusses both matter and energy, while the title only mentions matter. Including matter but not energy is what makes it an insufficient summary.


11 comments

It is difficult to grow cacti in a humid climate. It is difficult to raise orange trees in a cold climate. In most parts of a certain country, it is either easy to grow cacti or easy to raise orange trees.

Summary
In a humid climate, it’s difficult to grow cacti.
In a cold climate, it’s difficult to raise orange trees.
In most of a certain country, it’s easy to grow cacti or easy to raise orange trees.

Notable Valid Inferences
In most of a certain country, it’s either not humid or not cold. We’re looking for what must be false, so the correct answer should contradict this inference.

A
Half of the country is both humid and cold.
Must be false. We can infer that in most (over half) of the country, it’s either not humid or not cold. If half of the country is both humid and cold, that makes it impossible for over half to be not humid or not cold.
B
Most of the country is hot.
Could be true. As long as most of the country is not humid, this is consistent with the stimulus.
C
Some parts of the country are neither cold nor humid.
Could be true. We know most of the country is not cold or not humid. It’s possible some parts are neither cold nor humid.
D
It is not possible to raise cacti in the country.
Could be true. As long as in most of the country it’s easy to raise orange trees, it could be that cacti can’t be raised in the country.
E
Most parts of the country are humid.
Could be true. As long as most of the country is not cold, it’s possible most of the country is humid.

31 comments

Technological innovation rarely serves the interests of society as a whole. This can be seen from the fact that those responsible for technological advances are almost without exception motivated by considerations of personal gain rather than societal benefit in that they strive to develop commercially viable technology.

A
contains a premise that cannot possibly be true
There’s nothing about the premise that cannot be true. People responsible for tec. advances can be motivated by considerations of personal gain rather than societal benefit.
B
takes for granted that technology beneficial to society as a whole cannot be commercially viable
The author assumes that tech. that’s beneficial to society as a whole cannot be made for the PURPOSE of personal gain. But that doesn’t mean the tech. can’t be commercially viable. It can be, as long as the PURPOSE was not to produce something commercialy viable.
C
fails to consider the possibility that actions motivated by a desire for personal gain often do not result in personal gain
Whether anyone actually gets personal gain is not relevant. The issue is whether someone who invents stuff for the PURPOSE of personal gain can make things that help society as a whole.
D
takes for granted that an action is unlikely to produce a certain outcome unless it is motivated by a desire to produce that outcome
The author assumes that an action (tech. advance) is unlikely to proudce a certain outcome (societal benefit) unless it’s motivated by a desire to produce that outcome. This captures the assumption that tech. advances made for personal gain can’t help society as a whole.
E
draws a conclusion about the practical consequences of people’s actions on the basis of theoretical views about what people should or should not do
The conc. isn’t based on “theoretical views about what people should or should not do.” The premise doesn’t describe what anyone should or shouldn’t do.

32 comments

Yolanda: Gaining access to computers without authorization and manipulating the data and programs they contain is comparable to joyriding in stolen cars; both involve breaking into private property and treating it recklessly. Joyriding, however, is the more dangerous crime because it physically endangers people, whereas only intellectual property is harmed in the case of computer crimes.

Arjun: I disagree! For example, unauthorized use of medical records systems in hospitals could damage data systems on which human lives depend, and therefore computer crimes also cause physical harm to people.

Speaker 1 Summary
Yolanda concludes that joyriding is more dangerous than accessing computers without authorization and manipulating the computer’s data or programs. This is because joyriding physically endangers people, whereas the computer crime only harms property.

Speaker 2 Summary
Arjun concludes that joyriding is not more dangerous than the computer crime. This is because unauthorized use of medical records systems might can causes physical harm to people by potentially damaging hospital data systems.

Objective
We’re looking for a point of disagreement. The speakers disagree on whether joyriding more dangerous than the computer crime. Yolanda thinks it is. Arjun thinks it’s not.

A
whether joyriding physically endangers human lives
Arjun doesn’t express an opinion. Arjun doesn’t say anything about joyriding or whether it endangers people physically.
B
whether the unauthorized manipulation of computer data involves damage to private property
Arjun doesn’t express an opinion or agrees. He points out that access to records systems could damage data systems. If data systems are property, then Arjun agrees that the computer crime can damage property. If data systems are not property, then he says nothing about property.
C
whether damage to physical property is more criminal than damage to intellectual property
Neither speaker has an opinion. The dispute is about which crime is more dangerous. Nobody connects the level of danger to what should be more or less criminal.
D
whether the unauthorized use of computers is as dangerous to people as is joyriding
This is a point of disagreement. Yolanda thinks the unauthorized use of computers is not as dangerous to people as is joyriding. Arjun thinks it is, because of the potential of computer access to damage hospital records, which in turn can damage people.
E
whether treating private property recklessly is ever a dangerous crime
Yolanda doesn’t express an opinion. She believes a crime that hurts only intellectual property isn’t as dangerous as joyriding. But she’s open to the computer crime being dangerous; just not as dangerous. And, she doesn’t say anything about crimes involving physical property.

17 comments