Problem: If you have a mass of 50 kg on Earth, what is your weight in newtons? An object with more mass is pulled by gravity with greater force. Mass and weight are closely related. However, the weight of an object can change if the force of gravity changes. On Earth, the force of gravity is the same everywhere. So how does the force of gravity change? It doesnt if you stay on Earth. What if we travel to another planet or moon in our solar system? Look at the photo of astronaut Edwin E. Aldrin Jr. taken by fellow astronaut Neil Armstrong in the Figure. They were the first humans to walk on the moon. An astronaut weighs less on the moon than he would on Earth. This is because the moons gravity is weaker than Earths. The astronauts mass, on the other hand, did not change. He still contained the same amount of matter on the moon as he did on Earth. If the astronaut weighed 175 pounds on Earth, he would have weighed only 29 pounds on the moon. If his mass on Earth was 80 kg, what would his mass have been on the moon? [Figure 3]

Question: "How does the force of gravity affect your weight?"

Answer: "More the force of gravity, less the weight"
Answer: no

Problem: The properties of matter depend on the types of atoms that matter is made of. Matter can exist in two forms. It can be a pure substance. This means it is not mixed with anything. It can also be a combination of different substances. This means it can be a mix of different types of atoms. You may recall that atoms differ based on the numbers of protons they contain. Some atoms contain only one proton such as Hydrogen. Other atoms contain many protons. There are many types of atoms. For example, Helium has two protons. An Oxygen atom has eight. Water is composed of a two types of atoms. Water is made of two Hydrogen atoms and one Oxygen atoms. There are only so many types of atoms. These atoms can be mixed into an almost limitless amount of substances. So what do we call a substance that has only a single type of atom?

Question: "Water is composed of which two atoms?"

Answer: "Helium"
Answer: no

Problem: 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.

Question: "Where do amateurs need to position themselves to pirate a secret transmitted over the air?"

Answer: "They need to position their dish at the right signal"
Answer:
no