Draw a ray diagram to show the passage of two rays of light through rectangular glass slap, when the angle of incidence is zero in one case and little less than 90degree in the other case
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ANS W ERS TO THE PRACTICAL QUESTIONS AND PROBLEMS CONTAINED IN THE FOURTEEN WEEKS COURSES Physiology, Philosophy, Astronomy, and Chemistry (old and New Edition). BY J. DORMAN STEELE, PH.D., F.G.S., AUTHOR OF THE FOURTEEN WEEKS SERIES IN PHYSIOLOGY, PHILOSOPHY, CHEMISTRY, ASTRONOMY, AND GEOLOGY. A. S. BARNES & COMPANY, NEW YORK AND CHICAGO.
Page 2 THE FOURTEEN WEEKS' COURSES IN NATURAL SCIENCE, BY J. DORMAN STEELE, A.M., PHI.D. Fourteen Weeks iq Natural Philosophy, Fourteen Weeks iq Ctlenqistry, Fourteen Weeks iq Descriptive Astroqonqy, Fourteel Weeks iq Popular Geology, Fourteeq Weeks iQ2 Human P1ysiology, Fourteen Weeks iq Zoology, Fourteeq Weeks iq Botany, A Key, containing Answers to the Questions and Problems in Steele's I4 Weeks' Courses, 4 1ISTORIC4L SERIES, ON THE PLAN OF STEELE'S 14 WEEKS IN THE SCIENCES. A Brief History of the Urlited States, A Brief History of France, The same publishers also offer the following standard scientific vworks, being more extended or difficult treatises than those of Prof. Steele, though still of Academic grade. Peck's Ganot's Natural Philosophy, Porter's Principles of Chemistry, Jarvis' Physiology and Laws of Healtl, Wood's Botanist and Florist, Clanlbers' Elenments of Zoology, lcIqtyre's Astroqomy and tle Globes, Page's. Elen~ents of Geology, Entered according to Act of Congress, in the year 1869, by A. S. BARNES & CO., In the Clerk's Office of the District Court of the United States for the Southern District of New York. sTERLE'S KEY.
Page 3 PREFACE. THIS little work is designed to aid teachers who are using the Fourteen Weeks Course. The problems contained in all the books are fully, and, it is thought, accurately solved. Great pains have been taken to revise and compare them carefully. The practical questions are answered, often not in full, yet enough so to give the key to the more perfect reply. The use of the text-books is presupposed, and the statements merely supplement, or apply the fuller theories therein contained and explained. On many points there may be a difference of opinion. The author often finds in his own classes a wide diversity. On mooted questions he has merely advanced one view, leaving the subject open for the discussion of other theories. Minute directions are given, pages 71-82 inclusive, for performing a course of experiments in Chemistry. It is hoped that these may be of service to teachers who, with incomplete appadatus, are trying to illustrate to their pupils some of the principles of that science. In all cases of doubt or misunderstanding with regard to the answers or solutions, the author will be pleased to correspond with any teacher using the Series ELMIRA, Mdrch 19, 1870
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Page 5 ANS WERS TO THE PRACTICAL QUESTIONS IN THE FOURTEEN WEEKS COURSE NATURAL PHILOSOPHY. LThe bold-faced figures refer to the pages of the Philosophy; the others to the number of the Practical Questions.] INERTIA. 26. I. If one is riding rapbidly, in which direction will he be thrown when the horse is suddenly stopped f. In the same direction in which he is going. He has the inotion of the carriage, and his inertia carries him forward. 2. Wkhen standing in a boat, why, as it starts, are we thrown backward? Because the inertia of our bodies keeps them stationary, while the boat carries our feet forward. 3. WIhen carrying a cup of tea, if we move or stop quickly, why is the liquid liable to spill? The inertia of the tea tends to keep it still or in motion, as the case may be. If we move the cup quickly, the motion is not imparted to the liquid soon enough to overcome the inertia. When, therefore, we start, the tea spills out backward; or, when we stop, it spills out forward. We understand this if we can tell why a cup of tea is more liable to spill than one of sugar
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