Question:
Mechanical energy is a combination of the energy of motion or position. This type of energy describes objects that are moving or could move. A moving ball can have energy from motion. An arrow can also have the energy of motion. Both are types of mechanical energy. Can you think of some other examples? Where does the energy of motion come from? It comes from the energy created by position. This energy is stored energy. This means it is not moving yet, but it has the potential to move. How can you store energy? The arrow gains energy from the drawn bow. As the arrow is released, the bow releases its stored energy and puts the arrow into motion. Can you think of some other ways to store energy using position? After reading the above, is "This type of energy" the correct answer to the question "What type of energy is released when a drawn bow releases an arrow?"?

Answer:
no

Question:
Chemical changes produce new substances. For this reason, they often cannot be undone. Some chemical changes can be reversed, sort of. To do so requires another chemical change to take place. For example, you can undo the tarnish on copper pennies by placing them in vinegar. The acid in the vinegar reacts with the tarnish. This is a chemical change that makes the pennies bright and shiny again. You can try this yourself at home to see how well it works. Other chemical changes cannot be reversed at all or may be difficult to do. Rusting is a chemical change. If metal rusts, the best you can do is to sand off the rust to get down to the shiny metal. Although the metal may now be shiny, the rust was removed. The rust was not changed back into the original metal. Some chemical reactions occur in only one direction. These reactions are called irreversible reactions. For example, you cannot change a fried egg back into a raw egg. Can you think of some other irreversible reactions related to cooking? Would you like a piece of cake? After reading the above, is "sometimes" the correct answer to the question "Can chemical changes be undone?"?

Answer:
yes

Question:
Magnets are able to place a force on certain materials. This force is called a magnetic force. The force a magnet exerts is a little different from the forces you may normally think about. You exert a force on a book when you lift it. You also exert a force on the pedals of your bicycle. In both those cases, those forces cause a change. The change you see in both these cases is called motion. Magnets, too, can produce change. They can produce motion just like you do. Unlike you, magnets do not have to touch something to exert a force. A magnetic force is exerted over a distance. Thats right, a magnet can push or pull certain items without ever touching them. Thats how the maglev train works. Do you know another type of force that does not require objects to touch? These forces are known as non-contact forces. Another type of non-contact force you may be familiar with is gravity. Gravity too can cause changes in motion. Gravity holds our moon in orbit without touching it. After reading the above, is "Magnets do not have to touch something to exert a force" the correct answer to the question "How do magnets produce change?"?

Answer:
yes

Question:
The after-action review had treated the CIA as the lead agency for any offensive against al Qaeda, and the principals, at their March 10 meeting, had endorsed strengthening the CIA's capability for that role. To the CTC, that meant proceeding with "The Plan," which it had put forward half a year earlier-hiring and training more case officers and building up the capabilities of foreign security services that provided intelligence via liaison. On occasion, as in Jordan in December 1999, these liaison services took direct action against al Qaeda cells. In the CTC and higher up, the CIA's managers believed that they desperately needed funds just to continue their current counterterrorism effort, for they reckoned that the millennium alert had already used up all of the Center's funds for the current fiscal year; the Bin Laden unit had spent 140 percent of its allocation. Tenet told us he met with Berger to discuss funding for counterterrorism just two days after the principals' meeting. While Clarke strongly favored giving the CIA more money for counterterrorism, he differed sharply with the CIA's managers about where it should come from. They insisted that the CIA had been shortchanged ever since the end of the Cold War. Their ability to perform any mission, counterterrorism included, they argued, depended on preserving what they had, restoring what they had lost since the beginning of the 1990s, and building from there-with across-the-board recruitment and training of new case officers, and the reopening of closed stations. To finance the counterterrorism effort, Tenet had gone to congressional leaders after the 1998 embassy bombings and persuaded them to give the CIA a special supplemental appropriation. Now, in the aftermath of the millennium alert, Tenet wanted a boost in overall funds for the CIA and another supplemental appropriation specifically for counterterrorism. To Clarke, this seemed evidence that the CIA's leadership did not give sufficient priority to the battle against Bin Laden and al Qaeda. He told us that James Pavitt, the head of the CIA's Directorate of Operations, "said if there's going to be money spent on going after Bin Laden, it should be given to him. My view was that he had had a lot of money to do it and a long time to do it, and I didn't want to put more good money after bad." The CIA had a very different attitude: Pavitt told us that while the CIA's Bin Laden unit did"extraordinary and commendable work," his chief of station in London "was just as much part of the al Qaeda struggle as an officer sitting in [the Bin Laden unit]." The dispute had large managerial implications, for Clarke had found Ailies in the Office of Management and Budget (OMB). After reading the above, is "Pavitt said they were in desperate need of funds, and met with Berger and claimed to have run on a short budget since WWII?" the correct answer to the question "The CIA said they were in desperate need of funds, who met with Berger and claimed to have run on a short budget since when?"?

Answer:
no