QUES: 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.
Do you have any questions?
MY QUESTION: What do the structures in a bird's eye allow them to do?

QUES: In India to purchase some horses , British aristocrat , Lord Esketh and his wife , Edwina , come to the town of Ranchipur at the invitation of the elderly Maharani . Their marriage is an unhappy one and Lord Esketh announces his intention to return to England and begin divorce proceedings . The spoiled , insensitive Edwina scoffs at this . She renews in Ranchipur an acquaintance with a former lover , Tom Ransome , now a dissolute alcoholic . She also meets and attempts to seduce a distinguished Hindu physician , Dr. Rama Safti , a decent man who is the elderly Maharani's personal choice to succeed her someday . Safti at first resists , but ultimately succumbs to Edwina's charms and falls hopelessly in love with her . Lord Esketh becomes aware of this , but Safti saves him from a man-eating tiger during a safari . Safti admits his love for Edwina to Lord Esketh , who is now sympathetic toward this good man's plight . Ransome feels the same way , warning Edwina to stay away from Safti , a friend he admires . Edwina similarly falls into disfavor with the Maharani , who explains that Safti has been raised to lead a pure life and that Edwina is unworthy of him . Ranchipur suddenly is ravaged by a natural disaster , an earthquake and flood . Dr. Safti is so busy saving lives that he can not personally care for Edwina , who has fallen ill . Ransome looks after her as well as for young Fern Simon , who has declared her love for him . When a dam is exploded by dynamite and as a result the flood waters recede , it is Dr. Safti who reveals that Ransome is the one who risked his personal safety to save the people of Ranchipur .
Do you have any questions?
MY QUESTION: Who looks after Edwina when she has fallen ill?

QUES: I'm here to tell you the story of a robot named Carl. He came from a far away land known as Factory. Carl was sad because he was missing a part called a tire. He also needed a sun gatherer. But, the tire was more important. Once Carl got all these parts he could travel to his new home in the nation of Lab and the city of Office. It was a tricky thing to get there with missing parts. Just as he had given up hope Carl got a message from Mr. X saying the new parts were ready to be delivered. This made the robot very happy. The parts arrived a few days later and Carl put them in with 2 days of work. After this Carl began to travel the last bit of his goal to get to his new job. After this Carl took 10 days to get to Lab.
Do you have any questions?
MY QUESTION: Which parts is Carl the robot missing?

QUES: Force is a vector. What then is a vector? Think about how you would give directions to a friend. You would not say, just walk half a mile. The person may walk a half mile in the wrong direction! More information is needed. You may say, follow this particular road for a half mile. You may say, look for the green house on Sumter St. In both examples, you provided a direction. You also gave the distance. In other words, you provided a vector. You did not just give a distance. Both pieces of information are needed to find a location. This is just like describing forces. To explain forces, both size and direction are needed. Notice the girl in Figure 1.1. She is pushing the swing away from herself. Thats the direction of the force. She can give the swing a strong push or a weak push.
Do you have any questions?
MY QUESTION:
What does a strong push or a weak push have to do with force?