Rough surfaces create more friction than smooth surfaces. Thats why cars have tires. Its also why we use rubber mats in areas that might get wet. In your bathtub, you may even use No-Slip tape. No-slip is another way of saying the items has a lot of friction. In Figure 1.9, the blades of the skates are very smooth. Thats why you cant slide across ice with shoes. The soles of your shoes are much rougher than skates. The rougher surface of shoes causes more friction and slows you down. Heavier objects also have more friction. A heavy object presses down with more force. The surfaces are held together more tightly. This makes the surfaces harder to slide past each other. Did you ever try to push something heavy across the floor? Heavy objects are much harder to push than light objects.

Question: "Why do we use rubber mats in areas that might get wet?"

Response: "Smooth surface"
OPTIONS:
- no
- yes

A: no

Problem: Rivers flowing over gentle slopes move more slowly. They move much more slowly than a mountain stream. These slow moving streams create different types of features than mountain streams. Slow moving water erodes the sides of their channels more than the bottom. Also, large curves in the stream form. These curves are called meanders. Meanders are caused by erosion and deposition. Remember, faster moving water causes erosion more quickly. Slower moving water erodes material more slowly. If water is moving slowly enough, the sediment being carried may settle out. This settling out, or dropping off, of sediment is deposition. The curves are called meanders because they slowly wander over the land. As meanders erode from side to side, they create a floodplain. This is a broad, flat area on both sides of a river. Eventually, a meander may become cut off from the rest of the river. This forms an oxbow lake.

Question: "Do mountain streams flow more slowly than rivers flowing over gentle slopes?"

Answer: "They flow at the same speed"

OPTIONS:
- no
- yes
Answer: no

Question:
Earths magnetic field helps protect Earth and its organisms. It protects us from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles. This is where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole. Knowing this helps them tell direction. Many animals have natural 'compasses' that work just as well. Birds like the garden warbler in Figure 1.36 use Earths magnetic field. They use it to guide their annual migrations. Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern. After reading the above, is "Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern" the correct answer to the question "How do garden warblers use the earth's magnetic field to guide animal migration?"? OPTIONS:
- no
- yes

Answer:
yes

Input: Electronic theft by foreign and industrial spies and disgruntled employees is costing U.S. companies billions and eroding their international competitive advantage. That was the message delivered by government and private security experts at an all-day conference on corporate electronic espionage. "Hostile and even friendly nations routinely steal information from U.S. companies and share it with their own companies," said Noel D. Matchett, a former staffer at the federal National Security Agency and now president of Information Security Inc., Silver Spring, Md. It "may well be" that theft of business data is "as serious a strategic threat to national security" as it is a threat to the survival of victimized U.S. firms, said Michelle Van Cleave, the White House's assistant director for National Security Affairs. The conference was jointly sponsored by the New York Institute of Technology School of Management and the Armed Forces Communications and Electronics Association, a joint industry-government trade group. Any secret can be pirated, the experts said, if it is transmitted over the air. Even rank amateurs can do it if they spend a few thousand dollars for a commercially available microwave receiver with amplifier and a VCR recorder. They need only position themselves near a company's satellite dish and wait. "You can have a dozen competitors stealing your secrets at the same time," Mr. Matchett said, adding : "It's a pretty good bet they won't get caught." The only way to catch an electronic thief, he said, is to set him up with erroneous information.
"Can amateurs pirate any secret transmitted over the air?" is "No only some secrets can be pirated"?

OPTIONS:
- no
- yes
Output: no

Input: Bin Laden and his aides did not need a very large sum to finance their planned attack on America. The 9/11 plotters eventually spent somewhere between $400,000 and $500,000 to plan and conduct their attack. Consistent with the importance of the project, al Qaeda funded the plotters. KSM provided his operatives with nearly all the money they needed to travel to the United States, train, and live. The plotters' tradecraft was not especially sophisticated, but it was good enough. They moved, stored, and spent their money in ordinary ways, easily defeating the detection mechanisms in place at the time. The origin of the funds remains unknown, although we have a general idea of how al Qaeda financed itself during the period leading up to 9/11. General Financing As we explained in chapter 2, Bin Laden did not fund al Qaeda through a personal fortune and a network of businesses in Sudan. Instead, al Qaeda relied primarily on a fund-raising network developed over time. The CIA now estimates that it cost al Qaeda about $30 million per year to sustain its activities before 9/11 and that this money was raised almost entirely through donations. For many years, the United States thought Bin Laden financed al Qaeda's expenses through a vast personal inheritance. Bin Laden purportedly inherited approximately $300 million when his father died, and was rumored to have had access to these funds to wage jihad while in Sudan and Afghanistan and to secure his leadership position in al Qaeda. In early 2000, the U.S. government discovered a different reality: roughly from 1970 through 1994, Bin Laden received about $1 million per year-a significant sum, to be sure, but not a $300 million fortune that could be used to fund jihad. Then, as part of a Saudi government crackdown early in the 1990s, the Bin Laden family was forced to find a buyer for Usama's share of the family company in 1994. The Saudi government subsequently froze the proceeds of the sale. This action had the effect of divesting Bin Laden of what otherwise might indeed have been a large fortune. Nor were Bin Laden's assets in Sudan a source of money for al Qaeda. When Bin Laden lived in Sudan from 1991 to 1996, he owned a number of businesses and other assets.

Does the response "$300 million" correctly answer the question "How much money did al Qaeda use to fund the 9/11 attacks?"?

OPTIONS:
- no
- yes
***
Output:
no