By The Carnegie Library of Pittsburgh
Offering a enjoyable and academic strategy to discover the wonders of the realm of technological know-how, this newly up to date version poses and solutions 2,200 questions, supplying an abundance of unique and engaging technology evidence. young children and adults will discover essentially the most attention-grabbing, strange, and quirky technological know-how curiosities resembling: Are mobile phones risky in your wellbeing and fitness? is identical pressure of yeast used to make varieties of beer? what's the cleanest fossil gasoline? what's the biggest invertebrate? Readers will locate this informative and stress-free source is chock choked with 1000's of exciting technology and expertise issues, from the interior workings of the human body and outer area to math, desktops, planes, trains, and vehicles.
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What does DOS stand for? DOS stands for “disk operating system,” a program that controls the computer’s transfer of data to and from a hard or floppy disk. Frequently, it is combined with the main operating system. The operating system was originally developed at Seattle Computer Products as SCP-DOS. When IBM decided to build a personal computer and needed an operating system, it chose the SCP-DOS after reaching an agreement with the Microsoft Corporation to produce the actual operating system.
7854. What are the common mathematical formulas for volume? Volume of a sphere: Volume ϭ 4/3 times pi times the cube of the radius 24 V ϭ 4/3 ϫ r3 Handy Science 2/16/11 11:26 AM Page 25 GENERAL SCIENCE, MATHEMATICS, AND TECHNOLOGY Volume of a pyramid: Volume ϭ 1/3 times the area of the base times the height V ϭ 1/3bh 25 Handy Science 2/16/11 11:26 AM Page 26 Volume of a cylinder: Volume ϭ area of the base times the height V ϭ bh Volume of a circular cylinder (with circular base): Volume ϭ pi times the square of the radius of the base times the height V ϭ r2h Volume of a cube: Volume ϭ the length of one side cubed V ϭ S3 Volume of a cone: Volume ϭ 1/3 times pi times the square of the radius of the base times the height V ϭ 1/3 r2h Volume of a rectangular solid: Volume ϭ length times width times height V ϭ lwh Who discovered the formula for the area of a triangle?
What is the Pythagorean theorem? In a right triangle (one where two of the sides meet in a 90-degree angle), the hypotenuse is the side opposite the right angle. The Pythagorean theorem, also known as the rule of Pythagoras, states that the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides (h2 ϭ a2 ϩ b2). If the lengths of the sides are: h ϭ 5 inches, a ϭ 4 inches, and b ϭ 3 inches, then: h ϭ ͌(a2 ϩ b2) ϭ ͌(42 ϩ 32) ϭ ͌(16 ϩ 9) ϭ ͌25 ϭ 5 The theorem is named for the Greek philosopher and mathematician Pythagoras (c.
