Sound waves are mechanical waves. They can travel only through matter. They cannot travel through empty space. This was demonstrated in the 1600s by a scientist named Robert Boyle. Boyle placed a ticking clock in a sealed glass jar. The clock could be heard ticking through the air and glass of the jar. Then Boyle pumped the air out of the jar. The clock was still running, but the ticking could not be heard. Thats because the sound couldnt travel without air particles to transfer the sound energy. Is there any other place where sound cannot be heard? Here is a hint: is there any other place that does not have air molecules? Thats right, in space sound cannot be transferred. So can astronauts hear each other? Yes, they can, because they are in enclosed space stations or pressurized suits.In both cases, they are surrounded by air molecules. If they left their space ship and did not use their electronics, they would not be able to hear each other. Next time you watch a science fiction movie, think about this factoid. When spaceships are destroyed by hostile alien beings, there would be no sound heard. Sound waves can travel through many kinds of matter.
What question would one ask from this paragraph?
Answer: In Boyle's experiment, what did he do to make the clock stop being heard while in the jar?

Elettra stuck the little slip of paper, on which the recipe was written, into her shabby pocket-book without looking at it. She could read and write fairly well, and had been used to helping her husband the under-steward with his accounts at Muro, but even if she had looked at the recipe she would have understood nothing of the doctor's hieroglyphics and abbreviated Latin words. The prescription was for a preparation of arsenic, which Matilde had formerly taken for some time. The chemist would not make any difficulty about preparing twenty doses of it for the Countess Macomer, though the whole quantity of arsenic contained in so many would probably be sufficient to kill one not accustomed to the medicine, if taken all at once. But though Matilde was so anxious to have the stuff before luncheon, she had a number of doses of it put away in a drawer, which she took out and counted, after Elettra had gone. She opened one of the little folded papers and looked at the fine white powder it contained, took a little on the end of her finger and tasted it. Then, from the same drawer, she took a package done up in coarser paper, and opened it likewise, looked at it, smelt it, and touched it with the tip of her tongue very cautiously indeed. It was white, too, but coarser than the medicine. She was very careful in tasting it, and she immediately rinsed her mouth with water, before she tied up the package again, shut the drawer, and put the key into her pocket.
What question would one ask from this paragraph?
Answer: When was Matilde hoping to receive more arsenic from the chemist?

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]
What question would one ask from this paragraph?
Answer: Why did Edwin E. Aldrin Jr. and Neil Armstrong weigh less on the moon?

After more than a year of effort, attorneys with Northwest Justice Project earlier this week told 25 families in a mobile home park here that they can keep their homes and no longer need to fear eviction. The East Wenatchee City Council has entered into an Interlocal Agreement with the Wenatchee Housing Authority authorizing the Authority to purchase and maintain the Mobile Park Plaza mobile home park. Located just north of the Wenatchee Valley Mall, the park had been threatened with closure for more than a year. "We cannot say enough about how relieved we are that this is over," said Manuel Luna, one of the residents of Mobile Park Plaza. "We were afraid that no solution would be found, and that our families would have no place to go. We are very grateful for the help of our attorneys. Without them, we would not have saved our homes. We are also thankful for the help of the Housing Authority, the City Council and Mayor Steve Lacy." Formerly owned by local businessman Dan Jennings, Mobile Park Plaza had been home to 45 low-income families, many of them Latino farm workers. In October 2000 Jennings gave the park residents notice of his intent to close the park effective November 30, 2001. While some park residents decided to move, others, including 25 families, organized an informal association to relocate or save their homes. Unable to afford private legal counsel, the families asked for help from legal services attorneys at the Northwest Justice Project and Columbia Legal Services. In the succeeding months, these attorneys worked with representatives of the Greater Wenatchee Housing Authority, the state Office of Community Development, Chelan County, the City of East Wenatchee, state legislators, Jennings and others to secure funding and find a solution. "There seemed to be a never-ending set of obstacles," said Patrick Pleas, an attorney with Northwest Justice Project. "Mr. Jennings had financial considerations, the City had growth and economic development considerations, and the State and Housing Authority had their own concerns. Thankfully, hard work and good will from all parties allowed us to find a solution that works for everyone." Northwest Justice Project and Columbia Legal Services are non-profit organizations that provide civil legal assistance to low-income individuals and families throughout Washington state. Members of the state's Access to Justice Network, these organizations work with thousands of volunteer attorneys to ensure that justice is available to those who face critical legal problems and can't afford private legal counsel.
What question would one ask from this paragraph?
Answer:
Were the residents confident they could take on this fight on their own without legal and Political help?