the 2nd scientific american book of mathematical puzzles diversions

... to a hive of bees Their mother having got of the butcher, her supply of meat, they next visited the fish stalls —"O mother! mother!" said the lively little boy, "see the fish all ... body These turtles are esteemed a great delicacy People bring them all the way from the West Indies, and sell them for a high price to the keepers of the hotels, who make soup of them; ... [...]... till they were tired— and then away they went to another part of the market But we will first show them a picture of a Turtle: see there he is on the next page, almost

Ngày tải lên: 28/06/2014, 19:20

... rather apt to exercise their power in a vexatious and capricious manner—more to show their authority than to further the interests of the railway As regards the actual working of ... needs or desires of their customers is, perhaps, attributable partly to the unreasonable nature of the demand, partly to an occasional pursuit of some pet theory of management, but, ... introduction of two other gauges... The recent boom and collapse in gold ventures was the result of stock exchange transactions, probably fraudulent, as, with the exception of the sea-bed

Ngày tải lên: 28/06/2014, 19:20

... joining the feet of the lars from the vertices of a triangle to the oppositesides perpendicu-5 The sum of the squares on two of my sides equalsthe square constructed on my third side 6 There are ... the second one third, and seven-to the youngest onesixth of them The three young men sat in front of their house contemplating how they could fill their father's wish without killing any of theanimals ... graph? 2 the shape formed by joining the mid-points of thetops of the columns? 3 the frequency curve shaped like a cocked hat? 4 the arithmetical average of the values of a variablequantity? 5 the

Ngày tải lên: 06/10/2014, 09:18

... Many of the problems were suggested by ideas originating in a variety of sources, including Crux Mathematicorl4m, Mathematics Magazine and the Mathematical Monthly, as well as various mathematics ... Competition Along with the problems come useftil hints, and rimiplete solutions The book will also be useful to anyone interested in the posing and solving of mathematical problems at the trndezgradtrate ... suggested by Problem 97 of The Green Hook It also appears as Problem E2115 in American Mathematical Monthly 75 (1968), p.897 with a solution by G.V McWilliams in American Mathematical Monthly 76

Ngày tải lên: 06/03/2018, 12:22

... and bet them they can't catch the bill Again, hold the bill in your right hand Let them (one at a time, of course) place their left hand loosely around the hanging bill Tell them to catchthe bill ... flying over the lake Mother: Your teacher tells me you're at the bottom of the class. Angie: Yeah, but they teach the same thing at both ends. Amy: There are eight in my family, Teach, but the clock ... fall off the bottomone.How did you do it? Spit (No, not now!) That's the secret of the trick: spit During the setup of the trick, while no one is paying attention to your hands, lick one ofyour

Ngày tải lên: 21/11/2020, 09:31

... joining the feet of the lars from the vertices of a triangle to the oppositesides perpendicu-5 The sum of the squares on two of my sides equalsthe square constructed on my third side 6 There are ... on the level straight road between thetowers The pigeons reach the grain at the sameinstant How far is the grain from the foot of thecathedral tower? Answers on pages 49-51. 12 Trang 159 Spot the ... one-ninth taller than at the end of the sixth year How tall was the tree at the end of the twelfth year? 7 Without doing the actual division state whether Trang 126 The Triangle TestA triangle

Ngày tải lên: 30/04/2021, 17:36

... each of the brothers become? 33 Beasts of Burden Three of the brothers, in their animal guises, were burdened with supplies for the town They carried either kegs of oil or drums of dates 1 If the ... debating with the Martians in the blue and the brown feathers, Bal and the Yomi were so an-gry that they tore a wingful of feathers out of them before they were stopped 3 Wora and the Rafi, however, ... use the number scale of the Australian aborigines and the African pyg- mies? Two, rather than ten, was proba- bly the basis of our first number sys- tem The solutions to some of the weight puzzles

Ngày tải lên: 30/04/2021, 17:38

... the odd prime p deg (f(z)) denotes the degree of the polynomial f(x) dct A denotes the determinant of the square matrix A Z denotes the domain of rational integers Q, R, C denote the fields of ... with sides of integrallength having the lengths of two sides of one triangle equal to the lengths oftwo sides of the other 82. Let a,b, cbe three real numbers with a <b < c The function ... is the probabilty of A winning allthe 00003'? 29. Let f(s) be a monic polynomial of degree n 1 with complex efficients Let x1, , s,,denote the n complex roots of f(s).ThediscriminantD(f) of the

Ngày tải lên: 20/10/2021, 21:48

... in the midst of another SCIENTIFIC AMERICAN April 1994 41 Copyright 1994 Scientific American, Inc. Trang 20The real wage of the average Amer-ican worker more than doubled between the end of ... asmall part of the decline in the relativeimportance of manufacturing to theeconomy Why, then, has the share ofmanufacturing declined? The immedi-ate reason is that the composition ofdomestic ... with thehelp of the AC Þeld, augmenting the av-erage tilt of the egg tray by increasingthe DC voltage does not change the av-erage current So if we plot the currentversus the DC voltage ( in the

Ngày tải lên: 12/05/2014, 14:54

... moon-scape of the Gobi One of the most important discover-ies in the history of scientiÞc explora-tion came in the midst of such diÛcul-ties Late in the Þrst Þeld season of 1922, the expedition ... precursors of the greatmammalian radiation that followed theextinction of the dinosaurs at the end of the Mesozoic The bulk of scientiÞc information onthese earlier mammals comes fromNorth American ... secrets ofprehistory, of the rise and fall of dino-saurs and other biological empires SCIENTIFIC AMERICAN December 1994 69 THE NEW CONQUEST OF CENTRAL ASIA Roy Chapman Andrews American Muse-um of

Ngày tải lên: 12/05/2014, 14:59

... of therelationship between the father andmother If the relationship is brief, Haigobserves, chances are that any otherchildren borne by the woman will bearthe genes of another man The longerthe ... movie of our watery planet The spacecraft examined the outer expanses of the earthÕs magnet-ic Þeld and took the Þrst mea-surements of the moonÕs far side since the days of the Apol-lo program These ... clear that in themidst of this tempest, with the mainscrews in the stern periodically lurch-ing out of the water, whether the ÒDPÓ SCIENCE AND THE CITIZEN Tempest on the High Sea The Ocean Drilling

Ngày tải lên: 12/05/2014, 15:03

... the New York Times for handing out blame in 1991 on the basis of a condemnatory draft report by the Of ce of Research Integrity (then the Of ce of Scientific Integrity) of the ... of absence The reshi-Kari, then at the Massachusetts In- quest came after the Of ce of Research stitute of. .. Dunbar found, the size of the neocortex predicts groupings of ... near the Hotel Metropole, London, November 14, to witness the departure of the motor carriages for their race to Brighton, 47 miles. The oc- casion of the race was the going into effect of the

Ngày tải lên: 12/05/2014, 15:16

... 1920. The problem and the method of solving it can be easily extended to networks in the form of the other four Platonic solids. The three ways to number the faces of an octahedron so that the ... folding a strip of paper as explained in the first Scientific American Book of Mathe- matical Puzzles and Diversions. Close cousins to the hexa- flexagons are a wide variety of four-sided ... difficult to find a satisfactory proof. The 2nd SCIENTIFIC AMERICAN Book of ILLUSTRATED WITH DRAWINGS AND DIAGRAMS MARTIN GARDNER Mathematical Puzzles A NEW SELECTION : from...

Ngày tải lên: 31/05/2014, 01:31

... in the central portion of the mirror, where it is sup- ported by the edge of the tool. Hence the center of the mirror and edge of the tool grind fastest, the mirror becoming concave and the ... of the mirror. The size of the image will change as the mirror is moved toward or away from the screen. Find the dis- tance at which it is minimum. This is the approximate focal length of the ... responsible for the development of vitamin B^. The motivation of the scientist, professional or amateur, is the sheer joy of knowing. In fact, that is one of the principal satis- factions of being...

Ngày tải lên: 12/05/2014, 16:40

... now they were sitting on the throne of God, the only being higher than the president of the United States of America. They were members of the final American government. They would be responsible ... to them. Imagine all the pride in the history of America felt in one rush. They suddenly had proof of God, they were the most important men to have ever lived, they had jurisdiction over the ... the book you’re reading. So where’s the confusion? The book was about a writer in his fifties working on a book. In the future the book has yet to be written, even if it was written in the...

Ngày tải lên: 15/03/2014, 06:20

... depend on their time of maturity, the longevity of the breed, and the stamina of the individual. 11th. No violent cross, or mixing of distinct breeds, should ever be admitted for the purposes of perpetuation, ... value of the improved and ordinary breeds. A knowledge of the best mode of breeding and management is of still higher importance. The first will enable the breeder to preserve the high character of the ... necessary either for breeding or use. Throughout the Northeastern states, cows for the dairy, oxen for the yoke, and both for the butcher, are wanted. In much of the West and South, beef alone is the...

Ngày tải lên: 28/06/2014, 19:20

... one goblin skurried after, The Project Gutenberg EBook of Goblin Market, The Prince's Progress, and Other Poems, by Christina Rossetti This eBook is for the use of anyone anywhere at no cost ... Helen Grey 'By the Waters of Babylon' Seasons Mother Country A Smile and a Sigh Dead Hope Autumn Violets 'They Desire a Better Country' The Offering of the New Law Conference ... or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: Goblin Market, The Prince's Progress, and Other Poems Author:...

Ngày tải lên: 28/06/2014, 19:20

... to hold all these pictures, and each one of these books costs a thousand dollars. There were only seventy-five or eighty of these sets of bird books made, but you can see them in the Boston Public Library, ... to make pictures of these birds, listening to their songs, finding what kind of nests they built, and at what time of year they flew north or south. The Child's Book of American Biography, ... the worst thing he did was to join some other boys in the string joke. They used to tie strings from the seats of the bakery-wagons to the posts of high stoops and watch these strings knock off...

Ngày tải lên: 18/02/2014, 08:20

... College. I used the first edition of The Little Book of Semaphores along with one of the standard textbooks, and I taught Synchronization as a concurrent thread for the duration of the course. Each ... -4. When the 5th thread signals the barrier, one of the waiting threads is allowed to proceed, and the semaphore is incremented to -3. But then no one signals the semaphore again and none of the other ... al- lowed. At any time, the value of the semaphore represents the number of additional threads that may enter. If the value is zero, then the next thread will block until one of the threads inside...

Ngày tải lên: 15/03/2014, 11:20